![The chapel](/_next/image?url=http%3A%2F%2Flocalhost%3A4000%2Fimages%2Fa%2F67%2Fc0%2Fc3%2F67c0c3ae-e9cd-45dc-95c9-30bcc32b88b5.jpg&w=3840&q=70)
Templars knights raised their seat in Laon in 1128. In 1134, pope allowed them to raise a chapel dedicated to saint John the Baptist.
And when the order was dissolved in 1312, it was Saint-John of Jerusalem order who owned the chapel...
Façades are pretty sobers, with only little heads sculpted on the cornice.
We have 3 parts: the rectangular porch, the rotunda and the circular apse.
It looks like the octagon of Montmorillon, also raised by the Jerusalem order, based of St-Sepulchre in Jerusalem!