The history of the church begins before 815, when the village of Fröttmaning was first mentioned officially. A deed of donation in connection with the church from the year 815 is the oldest document in the Bavarian State Archive. The Fröttmaning noble Situli at that time had offered a wooden church, together with the farmland, to the Freising bishopric, which was consecrated by Bishop Hitto of Freising. Today's late Romanesque building with its thick walls was built for the most part at the beginning of the 13th century. The Church of the Holy Cross is one of the churches with steeple above the choir which was typical for the Bishopric of Freising at that time. The Romanesque spire with round arch windows and frieze is eighteen meters high, the church itself is fifteen meters long and nearly seven meters wide. The battlement with its embrasures is still visible in the inner wall. Particularly rare and unique in Germany are the Romanesque frescoes painted directly on the red bricks of the interior with lime paint, which were discovered only in 1981 during renovations and then partly exposed. The painted circles around a tree of life symbolize the sun. One of the wall paintings is the oldest representation of Christ in Bavaria. The rest of the church is predominantly from the baroque period. The ceiling fresco painted by pupils of the Asam brothers around 1740, it shows the worship of the Holy Cross.
Sunken village
With the construction of the nearby Allianz Arena, an international competition for an artwork was initiated which was won by Timm Ulrichs. He created a copy of the church as building structure as the Fröttmaning mountain of rubble had been included in the competition area. The focus is on the disappearance of the former village of Fröttmaning. Approximately 150 meters south of the Holy Cross Church, in 2006, an untraceable look-alike of the Romanesque church was created in original size from painted precast concrete parts. The surreal-melancholic work of art "sunken village" at the foot of the Fröttmaning mountain of rubble is a kind of a loss display, the disappearing in this place. The copy was arranged in such a way that the building seems half buried from the mountain.
