In April 1306, shortly before turning twenty-one, Edmund was granted possession of his father's title and land. On 22 May 1306, he was knighted by Edward I, along with the young Prince Edward (the future Edward II). The knighting was done in expectation of military service the Scottish Wars, and after the campaign was over, Arundel was richly rewarded. Edward I pardoned the young earl a debt of £4,234. This flow of patronage continued after the death of Edward I in 1307; in 1308 Edward II returned the hundred of Purslow to Arundel, an honour that Edward I had confiscated from Edmund's father. There were also official honours in the early years of Edward II's reign. At the new king's coronation on 25 February 1308, Arundel officiated as chief butler (or "pincerna"), a hereditary office of the earls of Arundel.