The ancestral seat of the Kirchbergers was probably in Unterkirchberg, in what is now the municipality of Illerkirchberg . Towards the end of the 11th century, it was moved up the Iller to Oberkirchberg, where a hilltop castle was built, where the Fugger Castle now stands. The Kirchberg coat of arms, which has not been interpreted satisfactorily, shows a woman (later often a Mohrin) holding a helmet or a lily, later a mitre, in her hands.Note: The main and almost exclusive source for this post is this article by Sarah Hadry. Individual passages in the text are not referred to in this article, as the entry here is essentially just a compressed excerpt from the source mentioned.
