Eastminster (The Abbey of St. Mary de Graces) was a Cistercian abbey on Tower Hill in London, founded by Edward III in 1350 immediately outside the Roman London Wall and thus today in the E1 postcode district. Among its endowments was the reversion in 1350 given by King Edward which he owned of one of the four manors of Shere in the hamlet of Gomshall, Surrey which acquired the name Towerhill, due to its patronage of the abbey. The abbey was dissolved in 1538, and the site has for centuries been occupied by the London part of the Royal Mint.