When the Venetians took over the Peloponnese in 1687, it was converted into a church dedicated to Saint Anthony of Padua, but it was made back into a mosque upon the 1715 Ottoman reconquest.

For fifty-three years, from 1831 to 1884, Trianon Mosque functioned as a school before it was closed due to health concerns.

[7] Built with brick and stone, Trianon Mosque is a building with a simple rectangular plan, and an octagonal dome.

Its entrance has an arched, colonnaded porch sheltered by three smaller domes; to the west of the building there used to be a small courtyard, which is not preserved today.

[8] In order to serve the needs arising from the new functions, false ceilings were added in 1915, thus covering the domes, internal staircases and reinforced concrete mezzanine.