The Prince of Gwynedd had been recognised by the English Crown as Prince of Wales in 1267, holding his lands with the king of England as his feudal overlord. It was thus that the English interpreted the title of Llywelyn ap Gruffudd, Lord of Aberffraw, which was briefly held after his death by his successor Dafydd ap Gruffudd. This meant that when Llywelyn rebelled, the English interpreted it as an act of treason. Accordingly, his lands escheated to the king of England, and Edward I took possession of the Principality of Wales by military conquest from 1282 to 1283. By this means the principality became "united and annexed" to the Crown of England.