The Gathering Storm
The Second Barons' War (1264–1267) was a civil war between Henry III and a coalition of rebel barons led by Simon de Montfort, Earl of Leicester. The causes were familiar: royal overreach, excessive taxation, and the influence of foreign favourites at court. In 1258, the Provisions of Oxford had forced Henry to accept a council of barons to govern alongside him — a direct echo of Magna Carta. But Henry repudiated the provisions, and in 1264, war broke out. At the Battle of Lewes (14 May 1264), de Montfort's forces captured King Henry and his son Edward (the future Edward I). For over a year, de Montfort effectively ruled England, summoning what is sometimes called the first representative parliament.
De Montfort's parliament of 1265 included representatives from towns and boroughs for the first time — a revolutionary step toward modern democracy, born from civil war.
The Barony During the Crisis
During the Second Barons' War, the Barony of Brattleby was held by Margaret de Longespee (8th Baron) and her husband Henry de Lacy. Henry was still a young man during this conflict, but the crisis shaped his entire political outlook. He witnessed firsthand the catastrophic consequences of baronial rebellion and the importance of royal authority. These lessons would make him one of the most loyal servants of the Crown in the next generation. The family's experiences during this war — seeing England torn apart, watching de Montfort rise and fall, enduring the disruption to their vast Lincolnshire estates — forged Henry de Lacy into the statesman he would become.
The Battle of Evesham and Its Aftermath
On 4 August 1265, Prince Edward (who had escaped captivity) cornered de Montfort at Evesham. The battle was less a fight than a massacre — de Montfort was killed and his body mutilated. Henry III was restored, but the aftermath was brutal. The 'Disinherited' — barons who had supported de Montfort — were stripped of their lands, leading to years of guerrilla warfare and banditry. It was not until the Dictum of Kenilworth (1266) and the Statute of Marlborough (1267) that peace was fully restored. For the Barony of Brattleby, the Second Barons' War reinforced a pattern that ran through its entire history: the barony's fortunes were inextricably tied to the Crown, and those who remained loyal were rewarded.