The Great Seal of Scotland mentions Thomas Lauder (later Bishop of Dunkeld) as Master of the Hospital of Soutra on 26 February 1439 (no. 226) and 20 May 1444 (no. 298). A Supplication to Rome dated 7 October 1444 states that he "had been Rector of the church or House of the Holy Trinity of Soltre, Diocese of Saint Andrews, for over seven years". In the supplication dated 7 October 1444 the whole status of the foundation and the purpose of the hospital is discussed, where it is stated that it was "the founders intention to found there a hospital for the reception of the poor rather than a religious place". Its description of the site says: "the church is built at the top of a hill near a public way where there often fierce winds and frequent cold spells".