This is the oldest remaining architectural feature in Monaghan town and dates from the 17th century. Known as the Old Cross, its origins are unclear. It is not fully agreed that it is in fact a cross, it may in fact have been a seventeenth century sundial. It was originally in the Diamond, the traditional centre of Monaghan town, and was used as a hiring cross and for the attaching of proclamations. It was moved to its present location in 1876 to allow for the construction of the Rossmore Memorial. It has an unusual head - consisting of a polygonal piece of stone with concave sockets in three faces.