Heritage Open Day: The oldest church in Darlington, c1125, including interesting stonework and woodwork. Some Saxon relic stonework and extensive 17th century 'Cosin' woodwork throughout the church. This year we are celebrating the 900th anniversary of this church. Discover an ancient Norman church, c.1125, listed with Grade I status, with Saxon relics. The oldest church in Darlington. Very rare woodwork, designed by the Rt Revd Cosin in the 17th century, ancient brasses and hatchments. As part of the 900th Celebrations there is an exhibition, in the church, entitled 'Images of Haughton'.