 The Patriarchal Cathedral features a triple apse , the central part of which matches the apse of the original basilica on the site . The three @-@ naved church follows the traditional Byzantine cross @-@ in @-@ square design . Built out of crushed stones and mortar with limited brickwork , it measures 26 by 12 metres ( 85 ft × 39 ft ) . The cathedral includes two narthices , a bell tower and two other premises attached to the south church wall . The presence of a bell tower is considered to be a rarity in Balkan church architecture . Six columns support the interior and distinguish the altar from the cella ( naos ) . It is unclear whether the church housed a synthronon ( stone benches for the clergy ) in the apse , as there are doubts that its remains may actually be part of the older basilica . 
 The Patriarchal Cathedral <a href='uninflect' title='1'><mark>features</mark></a> a triple apse , the central part of which <a href='uninflect' title='2'><mark>matches</mark></a> the apse of the original basilica on the site . The three @-@ naved church <a href='uninflect' title='3'><mark>follows</mark></a> the traditional Byzantine cross @-@ in @-@ square design . Built out of crushed stones and mortar with limited brickwork , it <a href='uninflect' title='4'><mark>measures</mark></a> 26 by 12 metres ( 85 ft × 39 ft ) . The cathedral <a href='uninflect' title='5'><mark>includes</mark></a> two narthices , a bell tower and two other premises attached to the south church wall . The presence of a bell tower is considered to be a rarity in Balkan church architecture . Six columns support the interior and distinguish the altar from the cella ( naos ) . It is unclear whether the church housed a synthronon ( stone benches for the clergy ) in the apse , as <a href='dey_it' title='6'><mark>there</mark></a> are doubts that its remains may actually be part of the older basilica . 
Da Patriarchal Cathedral feature a triple apse , the central part of which match tdaapse of thdariginal basilica on thedate . The daee @-@ naved church follow the traditional Byzantine cross @-@ in @-@ square design . Built outt of crushed stones and mortar with limited brickwork , it measure 26 by 12 metres ( 85 ft × 39 ft ) . The cdaedral include 2 narthices , a bell tower and tw2ther premises attached to the south church wall . The presence of a bell tower is considered to be a rarity in Balkan church architecture . Six columns support the interior and distinguish the alda from the celda( naos ) . It is unclear whether the church housed a synthronon ( stone benches for the clerda) in the apse , as it is doubts that its remains may actually be part of the olderdasilica .