Gothic Eggenberg
In 1625 Prince Hans Ulrich von Eggenberg selected the exact same place chosen as the site of the family seat by his great-grandfather, Balthasar Eggenberger, one and a half centuries earlier for the construction of the new residence. Parts of the previous medieval castle were, however, kept and incorporated into the newly constructed Baroque four-winged palace. The central tower with its gothic chapel even became the very core of the new palace. Traces of this medieval structure are still being discovered today.
Eckhenperg
The ancestral seat on the fields of Algersdorf
Balthasar Eggenberger purchased the “Orthof” on the fields of Algersdorf, just one mile to the west of the city of Graz before 1464. Over the following years he had this fortified manor house extensively converted and expanded. At present only little can be said regarding the appearance of the family’s ancestral seat. 
Gothic chapel
Balthasar Eggenberger had a sanctuary of the Virgin Mary constructed in the tower of his estate in 1470. This "capella Beate Marie Virginis sita in Castro Eckenperg" - as it is named in an indulgence document - forms the very core of the castle built by his famous descendant, Prince Hans Ulrich. 
The Eggenberg altarpiece
In the face of the unsettled times, it was only natural to look to Mary Help of Christians for protection. Thus, the Mother of God is also placed in the centre of the magnificent Eggenberg retable, which was donated by Balthasar prior to 1470. The 13 panels of the retable can still be seen today, while the altar structures were dismantled in the 18th century. 







