Hässelbyholm Castle

Hässelbyholm is a Renaissance-style manor house situated on a peninsula in Lake Mälaren within Strängnäs Municipality, Södermanland County, Sweden. Although often categorized alongside castles due to its historical prominence, it functions architecturally as a stately home. The estate originated from the merger of two separate properties, Hässelby and Ekeby. Its recorded history dates back to 1279 when Werner Brunkow Ekeby sold the land to the Bishop of Strängnäs. Throughout the mid-14th century, the property was under the ownership of Vårfruberga Abbey before transitioning to crown property following the Protestant Reformation. This shift marked a significant change in its administrative status, moving from ecclesiastical control to royal possession during a pivotal era in Swedish religious and political history.

The manor gained notable historical significance in the 18th century through its association with Christina Piper, the widow of Count Carl Piper. She purchased the estate in 1738 and, in 1747, established it as a fideicommissum. This legal arrangement ensured that the property would remain intact and pass directly to her granddaughter, Countess Eva Charlotta Bielke, and subsequent heirs, preventing its division or sale. This action preserved the estate's integrity for future generations. While specific details regarding its current condition or public accessibility are not extensively documented in available records, the site remains a recognized cultural landmark. It is frequently included in listings of historic castles and manors surrounding Lake Mälaren, reflecting its enduring presence in the regional landscape.