De Marisco was captured in 1242 and on Henry's order dragged from Westminster to the Tower of London to be executed. There he was hanged from a gibbet until dead. His corpse was disembowelled, his entrails burned, his body quartered and the parts distributed to cities across the country. The punishment is more frequently recorded during Edward I's reign. The Welsh Prince Dafydd ap Gruffydd became the first nobleman in England to be hanged, drawn, and quartered after he turned against the king and proclaimed himself Prince of Wales and Lord of Snowdon. Dafydd's rebellion infuriated Edward I so much that he demanded a novel punishment. Therefore, following his capture and trial in 1283, for his betrayal he was drawn by horse to his place of execution. For killing English nobles he was hanged alive. For killing those nobles at Easter he was eviscerated and his entrails burned. For conspiring to kill the king in various parts of the realm, his body was quartered and the parts sent across the country; his head was placed on top of the Tower of London. A similar fate was suffered by the Scottish leader Sir William Wallace. Captured and tried in 1305, he was forced to wear a crown of laurel leaves and was drawn to Smithfield, where he was hanged and beheaded. His entrails were then burned and his corpse quartered. His head was set on London Bridge and the quarters sent to Newcastle, Berwick, Stirling, and Perth. These and other executions, such as those of Andrew Harclay, 1st Earl of Carlisle, and Hugh Despenser the Younger, which each occurred during King Edward II's reign, happened when acts of treason in England, and their punishments, were not clearly defined in common law. Treason was based on an allegiance to the sovereign from all subjects aged 14 or over and it remained for the king and his judges to determine whether that allegiance had been broken. Edward III's justices had offered somewhat over-zealous interpretations of what activities constituted treason, "calling felonies treasons and afforcing indictments by talk of accroachment of the royal power", prompting parliamentary demands to clarify the law. Edward therefore introduced the Treason Act 1351. It was enacted at a time in English history when a monarch's right to rule was indisputable and was therefore written principally to protect the throne and sovereign. The new law offered a narrower definition of treason than had existed before and split the old feudal offence into two classes.