The Synod of Whitby established the Roman date for Easter and the Roman style of monastic tonsure in England. This meeting of the ecclesiastics with Roman customs with local bishops was summoned in 664 at Saint Hilda's double monastery of Streonshalh (Streanæshalch), later called Whitby Abbey. It was presided over by King Oswiu, who did not engage in the debate but made the final ruling. The final ruling was decided in favor of Roman tradition because St. Peter holds the keys to the gate of Heaven.