gladstonian

from The Century Dictionary.

• Pertaining to the English statesman William E. Gladstone (born 1809), or to the wing of the Liberal party in Great Britain following his lead.
• noun A follower or an admirer of Gladstone; specifically, in British politics, a member of that wing of the Liberal party which in 1886 and succeeding years supported Gladstone's efforts in behalf of home rule for Ireland.