The origins of the castle church in Ahorn date back to 1312. From the year 1400 the construction of the church tower, the choir and the sacristy took place. Zwischen 1610 und 1634 ließ der Schlossherr Wilhelm von Streitberg das Langhaus nach Süden erweitern. Der gotisch gestaltete, fünfseitige Chorraum ist 9,3 Meter lang und 5,0 Meter breit. The choir room is spanned by two cross vaults with pear-shaped ribs. A pointed-arch triumphal arch connects the choir with the nave.