Haselstein Castle Ruins

Haselstein Castle is the ruin of a hilltop castle near Haselstein in the municipality of Nüsttal in the Fulda district in Hesse. It is located next to the village on a steep basalt cone at 434 m above sea level. NN, which is mentioned for the first time in 780/781 as "Haselahastein".
The hilltop castle, which was probably built in the 11th century (or even earlier) by the lords of Haselstein, was first mentioned in 1119 when it was conquered by the Fulda abbot Erlof von Bergholz to put an end to the robber baronism that began with it. The first known lord of the castle was Wigger von Hasela, named in 1135. From 1156, after being conquered again, the castle was finally in the possession of Fulda and became the seat of Fulda officials, including the lords of Haselstein (until they died out in 1330) and the lords of the Tann, who administered the Haselstein office from there. The later Electorate Court Councilor and envoy Eberhard von der Tann, who introduced the Reformation there in 1534 as regent of the Tann rule, was born in 1495 at Haselstein Castle.
The castle was last mentioned in 1512 when Dietrich von Ebersberg was bailiff there. At the foot of the castle hill, a new office building was built in 1546, and the no longer used castle fell into disrepair or served as a quarry. Only small remnants of the surrounding wall and two sides of the former gate tower are left of the former castle complex. The round keep, which has now completely disappeared, was once around six meters in diameter.

Source: Wikipedia