When you think of the medieval era, you might picture chivalry and castles, but the reality was often far messier. In fact, the continent was peppered with a handful of particularly audacious scoundrels. These 10 notorious rogues left a trail of terror, loot, and legend across Europe, proving that lawlessness could be as organized as any royal army.
Why These 10 Notorious Rogues Matter
Each of these villains exploited the cracks in feudal authority, turning chaos into personal empire. Their stories reveal how mercenary bands, pirate crews, and renegade nobles could rival kings, and why their names still echo in the annals of history.
10 Seguin De Badefol
Seguin de Badefol first surfaces in the chronicles as a hired sword for King John II of France. After the French king suffered defeat at the hands of the Black Prince at Poitiers, a peace treaty forced the dismissal of the royal mercenaries, leaving men of war without pay.
Rather than disperse, the bands simply morphed into marauding gangs. Badefol commanded the Margot, a formidable troupe that could muster up to two thousand men. His signature extortion scheme involved seizing a town, then demanding a hefty “leave‑our‑city” fee from its inhabitants.
When the crown finally sent an army in 1362, Badefol cleverly united the scattered companies into a single “Great Company” and crushed the royal force at the Battle of Brignais. The victory gave him free reign over eastern France, and his reign ended four years later when a poisoned quince, intended as tribute from the ruthless Charles “the Bad” of Navarre, claimed his life.
9 Geoffrey Of Mandeville
After King Henry I died without a male heir, the English throne became contested between his daughter, Empress Matilda, and Stephen of Blois. The resulting civil war—known as the Anarchy—left law and order in tatters across the realm.
Amid the turmoil, Geoffrey of Mandeville, a noble from East Anglia, rose to notoriety. Stephen initially rewarded him with the earldom of Essex for his support, but Geoffrey quickly switched sides, accepting Matilda’s promise of near‑unlimited authority over Essex. He later defected back to Stephen, trading his new lands for control of Middlesex and Hertfordshire.In 1143, Stephen attempted to curb Geoffrey’s ambitions, but the earl fled into the marshy fens of East Anglia, establishing a fortified base on the Isle of Ely. From there he launched raids, burning villages and terrorizing the countryside until an arrow struck him during a minor skirmish in 1144, ending his violent career.
8 Robert Fitz Hubert
During the Anarchy, King Stephen bolstered his forces with Flemish sellswords, a group that quickly earned a reputation for cruelty. Among them, the ferocious Robert Fitz Hubert stood out as perhaps the most brutal.
Robert arrived on English soil in 1139, but instead of entering Stephen’s service, he immediately seized Malmesbury Castle for himself. After Stephen expelled him, the mercenary turned to Matilda, offering his band for hire.
Not content with short‑term contracts, Robert slipped away from Matilda’s army and, in a daring nocturnal assault, captured Devizes Castle. He then summoned additional Flemish knights and embarked on a campaign to carve out a petty kingdom between Winchester and London. His ambitions were thwarted when John the Marshal tricked him into a false surrender, only to slam the castle gate shut as Robert entered, leading to his execution by hanging.
7 Eustace The Monk
At the height of his notoriety, Eustace the Monk was whispered about as a sorcerer‑like figure. Originally a monk, he fell from grace, was declared an outlaw, and fled to the English Channel where he became the era’s most infamous pirate.
Eustace proved a master of naval warfare, earning the attention of King John of England, who hired his fleet to wrest the Channel Islands from French control. Using the isle of Sark as a base, he raided the Norman coast and even ventured down the Seine for daring plunders.
In 1212, Eustace switched allegiance to the French, but his fleet met a brutal English counter‑attack in 1217. The English sailors hurled quicklime onto the enemy vessels, blinding crews and forcing a chaotic melee. Eustace was discovered hiding in the bilge of his own ship and was beheaded, condemned as “a traitor to the king and a most wicked pirate.”
6 Owain Red Hand
Owain Lawgoch, known as the “Red Hand,” was the last male‑line descendant of the ancient Welsh kings of Gwynedd and a celebrated warrior of the fourteenth century. Determined to reclaim his ancestral throne, he launched two separate invasions that sent shockwaves through England.
The first fleet was thwarted by a violent storm that prevented a landing, while the second expedition was diverted to aid the French king. When not attempting to seize Wales, Owain fought for France during the Hundred Years’ War, leading a company of Welsh mercenaries against Pedro the Cruel of Castile.
In 1375, he headed the Guglers—an immense mercenary army that marched into Switzerland—only to be ambushed in a night attack by enraged Swiss citizens. His life ended in 1378 when an English undercover agent assassinated him, ending the last hope of a Welsh royal resurgence.
5 Roger De Flor
Roger de Flor began his career as a member of the Knights Templar, but his disgraceful conduct during the Siege of Acre—where he commandeered a Templar galley and extorted exorbitant fees from civilians fleeing to Cyprus—earned him expulsion from the order.
After a stint as a pirate, Roger seized an opportunity when the king of Aragon dismissed thousands of soldiers following a peace treaty in 1302. He recruited roughly six thousand hardened fighters into a mercenary force known as the Catalan Company and secured a lucrative contract with the Byzantine emperor.
The Catalans achieved modest success against the Turks but quickly turned to looting Byzantine lands and clashing with imperial troops. Roger’s ambitions grew as he plotted to carve out his own kingdom in Anatolia. The Byzantines, branding him a bandit, assassinated him in 1305, ending his turbulent quest for power.
4 The Catalan Company
After Roger de Flor’s murder, the Byzantine Empire dispatched an army to eradicate his mercenaries. Though outnumbered, the veteran Catalan Company turned the tables, crushing the imperial forces at the Battle of Apros in 1305.
Following a rather feeble attempt to blockade Constantinople, the Company crossed into Greece, where the Duke of Athens recognized the threat they posed. He cleverly offered to hire the Catalans, hoping to redirect their ferocity.
The mercenaries seized extensive territories for the duke, but payment never arrived. In a bid to split the Company, the duke promised full wages and land to 500 Catalans who would turn against their comrades. Those 500 accepted the bribe, yet instead of betraying the rest, they secured their own share and delivered a stunning victory over the duke’s larger army, establishing a petty kingdom in Greece that endured for eight decades.
3 Adam The Leper
Mid‑fourteenth‑century England endured a wave of urban crime so severe that even the Black Prince’s servants were once ambushed, beaten, and robbed while buying food. The most infamous gang leader of this era was Adam the Leper, whose crew habitually targeted royal officials and wealthy merchants.
Adam’s most daring caper involved learning that Queen Philippa had entrusted a local merchant with a cache of valuable jewelry. The leper’s band surrounded the merchant’s house, demanding the jewels be handed over.
The merchant, refusing to surrender, fought back fiercely, repelling several assaults. Frustrated, Adam set the building ablaze, forcing the terrified merchant and his family to scramble for escape. In the chaos, Adam’s men held the flames at bay, compelling the merchant to surrender the precious gems. Remarkably, historical records suggest Adam escaped any punishment for this audacious theft.
2 Momcilo
Hajduk Momcilo rose from humble beginnings to become a feared Bulgarian brigand, commanding a personal army of peasants in the rugged Rhodope Mountains. Though he briefly served Stefan Dušan of Serbia, Momcilo truly came into his own during the Byzantine Civil War of 1341‑1347.
His reputation for backstabbing is legendary: he switched allegiances three consecutive years—1343, 1344, and 1345—playing both sides of the conflict to cement his own power in the contested borderlands.
Momcilo’s growing influence alarmed both the Byzantines and the emerging Ottoman Turks, prompting a joint assault on his stronghold at Peritheorion. Anticipating the tide turning against him, the city’s inhabitants locked his forces out of the gates, leading to his defeat and death at the hands of his own adversaries.
1 The Archpriest
Arnaud de Cervole, known as the Archpriest of Velines, abandoned clerical life for the chaotic world of mercenary warfare. After the Battle of Poitiers, he quickly realized that the weakened French crown could no longer contain the roaming bands of soldiers‑for‑hire.
He assembled the first “Great Company,” leading his troops into Provence, a region that had largely escaped the war’s devastation. Within months, his forces turned the once‑peaceful province into a scorched wasteland, even laying siege to Marseille with a force of three thousand men—though the city managed to hold out.
In 1358, the Archpriest cemented his notoriety by effectively holding the Pope hostage: he surrounded the Papal seat in Avignon and demanded a ransom of twenty‑thousand florins to withdraw his men. After extracting the payment, he returned to conventional mercenary work, joining the royal army that later suffered defeat at the Battle of Brignais at the hands of Seguin de Badefol’s raiders.
By 1365, Arnaud was hired to lead a crusade against the Turks—a venture whose true purpose was to remove his unruly band from French soil. During a heated dispute over supplies, he was stabbed to death, ending the career of one of medieval Europe’s most infamous mercenary leaders.