Clan Sinclair to St Briavels Castle, and in 1296 he swore fealty to Edward I of England. In 1303 the Battle of Roslin took place where Scots under Henry Sinclair of Rosslyn and the Clan Comyn defeated an English force. The Battle of Loudoun Hill took place in 1307 where Scots under Robert the Bruce, assisted by Henry Sinclair of Rosslyn again defeated the English. The family initially favoured John Balliol's claim to the throne but later it became paramount that they gave their loyalty to Robert the Bruce. The Battle of Bannockburn was fought in 1314, where the Clan Sinclair fought
Robert the Bruce between English and Scottish occupation. Eventually it was defeated when Edward Bruce was killed at the Battle of Faughart. The Irish Annals of the period described the defeat of the Bruces by the English as one of the greatest things ever done for the Irish nation due to the fact it brought an end to the famine and pillaging wrought upon the Irish by both the Scots and the English. The reign of Robert Bruce also included some significant diplomatic achievements. The Declaration of Arbroath of 1320 strengthened his position, particularly in relation to the Papacy, and Pope John XXII