In this extract from his new book, Stephen Walker examines the transformation of the late Nobel laureate

Former UUP leader David Trimble during Drumcree protests in 1996. Photo: Brian Little

Former UUP leader David Trimble during Drumcree protests in 1996. Photo: Brian Little

A Sunday in January 1972 marked one of the blackest days of the Troubles.

On the penultimate day of the month, thousands of civil rights demonstrators took to the streets of Derry.