In England, the Bridgettine monastery of Syon Abbey at Isleworth, Middlesex, was founded and royally endowed by King Henry V in 1415, and became one of the richest, most fashionable, and influential religious communities in the country until its Dissolution under King Henry VIII. Elizabeth Sander was imprisoned on a mission in England and one of the monks of the community, Richard Reynolds, O.Ss.S., was among the first members of the English clergy to be executed as traitors for his refusal to accept the Oath of Supremacy. He was canonized as a martyr by Pope Paul VI in 1970.