The Mayor of Derry and Strabane, Councillor Sandra Duffy, will open a Book of Condolence this afternoon in the Guildhall in memory of the former First Minister and Ulster Unionist leader David Trimble.
The 77-year-old ex-leader of the Ulster Unionist Party was one of the principal architects of the Good Friday/Belfast Agreement that ended decades of conflict in the region.
Lord Trimble, who jointly won the Nobel Peace Prize along with SDLP leader John Hume, died on Monday following an illness.