http://agathe.gr/overview/the_church_of_the_holy_apostles.html
The Church of the Holy Apostles Though several churches were removed in the clearing of the site for excavation, it was decided to save and restore the little Byzantine church dedicated to the Holy Apostles ... The Church of the Holy Apostles Though several churches were removed in the clearing of the site for excavation, it was decided to save and restore the little Byzantine church dedicated to the Holy Apostles. View of the restored Church of the Holy Apostles from the southwest, April 2006 The church, with an unusual tetraconch interior plan and decorative tilework on the exterior, is among the oldest in Athens, probably to be dated just before A.D. 1000. ... Good Byzantine masonry, similar to that of the eastern part of the church was exposed on the lower part of the north wall as far as the door and bell tower.