Feeling called to religious life, she first spent some time with the Flemish Augustinian Canonesses. Finding this unsatisfactory, she decided to establish a Benedictine convent for English women. She purchased a house in Brussels and asked Benedictine nun Joanne Berkeley to be abbess.[3] Percy was joined by her sister Gertrude and Dorothy Arundell.[4] This was the first community of English nuns to be established since the Reformation.
The Convent of the Assumption of Our Blessed Lady was established in Brussels on 21 November 1599. Percy was clothed as a nun and made her profession of vows on 21 November 1600.[5] The first abbess was Joanne Berkeley. Percy brought to the monastery a dowry of 5000 florins.[1] Difficulties arose between those nuns who wanted a Jesuit confessor and those who preferred a different spiritual approach. These disagreements persisted into Percy's subsequent tenure as abbess.[6]
Berkeley died in 1616 and Percy was elected abbess, serving until her death in Brussels on 13 September 1642.[1] The convent had the support of the Infanta Isabella.
Works
Innocency Justified and Insolency Repressed (1632), Harley MS 4275
Isabella Berinzaga, Abridgement of Christian Perfection, translated by Mary Percy.