Roman Church 10th Century

Mooching around the back of buildings between the river, the market and the new tourist office area,  I discovered the oldest church in Chatellerault, which I never knew existed. 
I have been visiting this town for 9 years!  How dumb could I be!
The streets and buildings around it have recently received renovation. so maybe as other buildings around it have been destroyed as part of 'new development' perhaps it was that 'we couldn't see the wood for the trees'.

It was the first church founded by the Viscount of Chatellerault in 10th century. It was one of five parish churches of the former establishment. After the Siege of Poitiers in July 1569 when the Huguenots rioted, it was restored. After The Revolution it was converted into habitation. Today the secondary chapels and columns are conserved. It is a National Monument of France.

Extraordinary!