Manolia Cathedral (マノリア修道院 "Manoria Abbey"?) is a location in Chrono Trigger. It appears in the Middle Ages near Guardia Castle as an innocuous cathedral adjacent to a convent. Later, it is revealed to be a hideout for Fiends conducting guerrilla warfare on Guardia Castle. Manolia Cathedral is the first major dungeon.
The Manolia Cathedral is identical in color to the buildings in its time era, notably Guardia Castle. It has a red shingled roof, a steeple, and walls of light-colored stone. Inside, red carpets with gold floral embroidery line the floors. The walls in the halls are of dark stone. There are many statues of humanoid and gargoyle-like creatures scattered throughout. There are also collapsible staircases that link the main floor to a mezzanine level. Forests surround the enclosure where this cathedral resides and a lake sits peacefully behind. Nearby locations include Guardia Castle, Guardia Forest, Truce, and Truce Canyon. Unlike the trip to Guardia Castle, the player does not need to travel through a separate module to access this building; it can be accessed directly through the World Map.
After following Marle to the Middle Ages, Crono learns she is mistaken for her ancestor, Queen Leene. Because of this, the search party sent to rescue the real queen is called off, leading to her possible death and therefore Marle cannot be born in the present era. Crono decides to rescue the Queen to correct the timeline and resurrect his friend with help from Lucca.
Listening through the wall of the King's Bedroom in Guardia Castle, Crono learns the Chancellor is harboring the missing Queen Leene in a secret room of the cathedral. A maid in the castle also describes the place as not being quite right. With this information, Lucca and Crono searches the Cathedral for her. On their arrival, the party encounters several nuns. Nothing appears to be suspicious. However, Lucca quickly discovers a shimmer on the floor near the altar that turns out to be the Queen's coral pin, an object she guards with her life. Immediately after this discovery, the nuns in the Cathedral unveil themselves as Naga. After the player destroys them, another appears, slain immediately by an anthropomorphic frog. The sword-slinging amphibian is guardian to Leene and asks the party to join him in his search for her. Lucca is terrified of the frog at first, but eventually agrees. By playing the organ on the left-hand wall, the party accesses the rest of the cathedral. Battling through the proceeding halls, which are lined with Diablos, Naga-ettes, Bats and other surprises, they discover the Queen and her kidnapper. The Fiend Yakra, disguised as the Chancellor of Guardia, is in control of the cathedral and its monstrous inhabitants and holds Queen Leene and the real chancellor captive in a back room. When Crono, Lucca, and Frog discover this, they defeat Yakra and set the prisoners free.
The cathedral is probably destroyed in the war amassed by Dalton who returns to the main timeline and builds an army in Porre. Or sometime soon thereafter, as its location has been overgrown by Guardia Forest in 1000 AD. It is possible the cathedral could have been destroyed as a result of being tainted by Fiends.