A station in the City of London on the Central Line, in Travelcard Zone 1. It was opened by the Central London Railway on 30 July 1900 with the name Post Office: what is now Blackfriars Railway Station being then known as St Paul’s. Both stations received their present names 1937.
City Thameslink station was initially known as St Paul's Thameslink.
More information on the Wikipedia page [1]. The TfL page is [2].