British social surveys and census statistics defined ‘Sayyid’ as a caste identity, while often casting a sceptical eye on the authenticity of genealogical claims associated with the concept. The article examines how Muslims, especially Sayyid Ahmad Khan, participated in the formulation of the concept of Sayyid identity and status. Islamic ideology and practice have long wrestled with conflicting claims of religious equality and hierarchical status, often based on concepts of sacred lineage. From his earliest writings Sayyid Ahmad Khan (1817–98) emphasised his descent from the Prophet Muhammad on his father's side alongside his somewhat less exalted relationship with his Kashmiri grandfather. In later years he tried to balance universalistic ideals with claims to status based on supposedly ‘foreign’ ancestry, which he cited as parallel to the supposed Aryan ancestry of high-status Hindus. His British allies used his Sayyid ancestry as reinforcement of his leadership of an India-wide Muslim ‘community’ and evidence that India was not prepared to develop into a national polity based on representative government. But the Aligarh movement's claim to represent the wider Muslim population and in particular its educational project at Aligarh struggled with a more egalitarian ethos, defining students and the members of voluntary associations as ‘brothers’, and quite prepared to cross ascriptive boundaries both in public life and personal relationships.