László Vándor, the director of the Zala County Museum, said the museum was doing research on a wall of the church which was to be dismantled to build a vestry when the window was uncovered. The window of the church, built in the 13th century, had earlier been walled up.
Vándor called the 1.5-metre window a "national curiosity", explaining that the builder, who was working at the end of the Romanesque period, constructed a window with a gothic form, but with Romanesque tracery.
"It can't quite be called secessionist, but he created the window in an entirely unique style," Vándor said.
The museum has presented the rare find for scholarly study.
