The ruined cross-roofed church of Agios Nikolaos in Aipeia probably dates back to the first half of the 13th century. On its north side, a four-column propylon, now ruined, was constructed, which was covered with a cross-dome, of Gothic form.
A little later, a small chapel was added in contact with the north side of the original church, made of carved masonry, in which assimilated elements of Western architecture are also recognized. Agios Nikolaos of Aipeia, together with Agios Georgios in the same village and Agios Georgios of Androusa, constitute a monumental ensemble, valuable for the study of the architecture that took shape in the Peloponnese after the establishment of the Principality of Achaia in the early 13th century and the settlement in the region of the Western Crusaders.
In 2011, reinforcement works were carried out on the ruined southern church in order to address the immediate static problems of the monument. Inside the chapel, two unfinished tombs, probably from the 13th century, were discovered.
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