The Old Calton Burial Ground was the first substantial development on Calton Hill and lies on the south-western side of the hill. The philosopher David Hume is buried there. His tomb is engraved only with the year of his birth (1711) and death (1776), on the simple Roman tomb (a relatively large monument) which he prescribed. The Political Martyrs' Monument is also in the burial ground. This is in memory of five campaigners for political reform and universal suffrage who were convicted of sedition and sent in 1793 to Botany Bay, Australia.