Several years of litigation followed, and after being offered a substantial pension, Blackadder resigned the abbacy in 1476. In 1477 Blackadder's name is recorded in a letter of Pope Sixtus IV, where it is said that the pope had received a petition from "Robert Blakidir", a rector of the church of Lasswade in the diocese of St Andrews, requesting permission to build a hospital near the church. Permission and funds were granted, and so came into being the Hospital of St Mary of Consolation.
Following years of legal disputes, Blackadder resigned his abbacy in 1476 after receiving a substantial pension. In 1477, Pope Sixtus IV acknowledged a request from Robert Blakidir, a rector at Lasswade church, for permission to build a hospital near the church. The pope granted permission and funds, leading to the establishment of the Hospital of St Mary of Consolation.