The church of the parish of Saint Agatha was the first and for a long time the only building on the Wagram.
HAUSLEITEN. The location of the church and its documented relationship to the place indicate that it was the first and for a long time the only building on the Wagram. The parish is believed to have been founded around the year before 900. Long before the place name Hausleiten appears in the 14th century, documents in 1189 mention "Albertus, decanus st. agatha". Later, "am Wagram" was added. According to "Wikipedia", in 1324 the Bishop of Passau had 38 subjects in Hausleiten, the parish had 28 houses and a mill. The parish school was first mentioned in 1350. The weekly market was held on the square in front of the church for centuries. In 1544 the place remained Catholic despite the turmoil of the Reformation and the Protestant Count Hardegg. In 1590 there were 65 houses in Hausleiten, of which 49 belonged to the bishop, ten to the priest, two to the church and four to Count Hardegg. In 1758, Dean Gschellhammer had the rectory and outbuildings built. Between 1250 and 1270, the central nave and northern aisle with early Gothic windows were added to the Romanesque remains. The church thus became a three-aisled early Gothic basilica.