Whether as a unionist, or as an independent, T W Russell was never taken lightly by the parliamentary representatives of late Victorian unionism: directly, and obliquely, his contribution to the evolution of their movement was immense. As a popular unionist missionary in Britain between the first two home-rule bills, and as a protégé of Joseph Chamberlain, Russell was a valuable medium of communication between the British and Irish unionist parties. Moreover, he was both a champion of unionist farmer demands and a loyalist member of parliament; so Russell also created a vital bond between Irish unionism and rural opinion. As a member of the parliamentary Ulster party, Russell worked unstintingly for its success, provoking flexibility among both the more obtuse landed elements in the commons and among radical farmers in the counties. Yet, when he left unionism, his influence (now indirect) remained. Confronted by the spectre of presbyterian farmer militancy led by Russell, Irish unionist members of parliament meekly tailored their public pledges; and when, between 1900 and 1902, his agitation peaked, these members went further, revising the structure of their party in order to deflate his criticism and restore old loyalties. As one of the most significant forces in moulding twentieth-century unionism from nineteenth-century toryism, Russell merits special attention: his relationship with the unionist leadership in the strategically crucial years between 1894 and 1906 is examined here at length.