By the 15th century the cathedral stood within an extensive walled precinct known as the chanonry, containing the Bishop's Castle, the manses of the cathedral prebendaries,[nb 2] the houses of the vicars choral, St Nicholas' Hospital (founded in 1450), and the burial ground. Much was cleared away in the aftermath of the Scottish Reformation in 1560, and the only upstanding structure surviving today is the late 15th-century Provand's Lordship, on the west side of Castle Street.[10][2] In 1492 Pope Innocent VIII raised the see of Glasgow to the rank of archbishopric.