[1] Hubert de Burgh remained loyal to King John during the barons' rebellion in the last years of his reign.

De Burgh and Philip d'Aubigny brought together the king's troops at Rochester, but then John made peace with the rebels.

In Magna Carta (1215) de Burgh is listed as one of those who advised the king to sign, and his brother, Geoffrey (Bishop of Ely), was a witness.

Soon after the issuing of Magna Carta, de Burgh was officially declared Chief Justiciar of England and Ireland.

[5] During the First Barons' War (1215–17), Hubert de Burgh served John as sheriff of Kent (1216–25) and Surrey (1215–16), as well as castellan of Canterbury and Dover.

He successfully defended Dover Castle during a siege that lasted until John died (in October 1216), and the infant King Henry III was crowned.

[6] On 24 August 1217, a French fleet arrived off the coast of Sandwich in Kent, in order to provide Prince (later King) Louis of France, then ravaging England, with soldiers, siege engines and fresh supplies.

When Richard Marshal, 3rd Earl of Pembroke rebelled against the king in 1233, the men holding Hubert de Burgh captive released him and he subsequently joined the rebellion.

Hubert, however, protested that the match was not of his making, and promised to pay the king some money, so the matter passed by for the time.

[1] At Falaise he was the gaoler of Arthur I, Duke of Brittany, the nephew of King John and boy claimant to the English throne.

At some time before 1215, Hubert de Burgh is cited as having been appointed Lord Warden of the Cinque Ports (1215–20), which position later (after the Barons' War) included the ex officio constableship of Dover Castle.