English to German Other Architecture Abkürzung/Geschichtlicher Hintergrund

In a text or timeline, years given with the leading abbreviation ***c.***

Sorry I cannot tell for sure, whether a small or capital "c" - the font used makes it very hard to tell, unfortunately.

Two examples:

c. 710 Foundation of the Saxon priory of St Frideswide
The South Transept contains the Becket window (c. 1320).

Could it be this "c." stands for "commencing"?

Thank you for "enlightening" me! ;-)

Cheers,
Ulrike