Welsdorf was originally a part of the Stein barony in Fürstenfeld. Around 1550 this estate was acquired by Wolf von Wilfersdorf. His son, Jonas built a noble residence next to the "Meierhof" . For this in 1603 he received permission from Archduke Ferdinand to call it "Wolfsdorf". In 1605, peasant irregulars known as hajduks burned down Welsdorf Castle and the adjoining Meierhof . Both were successively reconstructed in the following years. 

The Augustinian Monastery at Pöllau bought Welsdorf in 1701 as a summer residence for the provosts, and it remained in the possession of the monastery until 1785, when it was secularised. Around 1716 Provost Johann Ernst Orttenhofen expanded Welsdorf. His coat of arms and that of the monastery  above the portal still remind us of that time. Three of the former four massive square corner towers are still preserved. Welsdorf Castle was once surrounded by a wall and bastions. Today, however, only fragments of the former fortifications remain.

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