Martin of Soure was a 12th-century Portuguese priest and canon of the Coimbra Cathedral. Born around 1050 to Manuel Aires and Argia, he received his clerical training under Bishop Maurice of Coimbra. Known for his charitable nature and virtuous conduct, he eventually moved to the border town of Soure around 1124. There, he worked alongside his brother Mendo to establish an ecclesiastical chapter, providing spiritual support to those affected by Almoravid attacks.