http://en.wikipedia.org/wiki/St_Dionis_BackchurchIt may be the influence of the French during the 13th century that the church was dedicated to St Denys who was the patron saint of France. St Denys, or St Dionysius, has been since the 9th century had been identified with Dionysius the Areopagite. The term Backchurch possibly arises from the fact that the church was set back from the main line of Fenchurch Street although it may have been from St Gabriel Fen church which until 1666 stood in the centre of the roadway and was referred to as Forechurch.
The earliest mention was at the beginning of the 11th century when it was 'St Dionis in Lime Street'. In 1250 it was known as 'St Dionis of Bakecherche' and as 'St Dionisius Batcherch' thirty years later. The church was rebuilt during the reign of Henry VI (1422-61/ 1470-71). In the Survay of London (1598), John Stow, writes "at the south-west corner of Lime Street standeth a fair parish church of St Dionys called Backe Church, lately new built in the reign of Henry VI."
It was burnt in the Great Fire and rebuilt by Wren in 1674 although the tower was not erected until 10 years later. The church which stood close by Lime Street was demolished in 1878 under the Union of City Benefices Act to make room for shops and warehouses. The parish was united with that of Allhallows, Lombard Street. The bells were transferred to this Allhallows and when this was demolished were supposed to go to St Dionis Parsons Green but went to St Paul's, Westminster Bridge Road, by mistake.. The proceeds of the sale, £7,000, was used to build St Dionis Parson Green.
There is a partial index to baptism and marriage in the IGI.
Baptism: 1538 to 1877; Marriages: 1538 to 1877 (accounts 1829-42); Burial 1538 to 1849.
http://www.steeljam.dircon.co.uk/churches/londonchurchlocation.htm[This site appears to be no longer supported.]