The Bishop's Palace, also known as Gresham's Castle, is an ornate Victorian-style house, located on Broadway and 14th Street in the East End Historic District of Galveston, Texas. The building was designed by Nicholas J. Clayton for Walter Gresham and completed in 1892. The Archidiocese of Galveston purchased the property in 1923 and used it as its headquarters for four decades, after which they opened it up for tours. In 2013, the Galveston Historical Foundation (GHF) acquired the property. , GHF continues to maintain the property and keep it open for public tours.
The house was built between 1887 and 1892 by Galveston architect Nicholas J. Clayton for lawyer and politician Walter Gresham, his wife Josephine, and their nine children.
Construction costs in 1892 are estimated at $250,000, while Clayton condensed many elaborate and eclectic design features onto a small homestead. Since Galveston experienced little population growth in the twentieth century, the high Victorian design of Bishop's Palace and other Clayton works from the 1890s characterize the town's architectural landscape. Clayton alternated medieval and Renaissance details onto the four towers, each rising four stories. In addition to these four towers, several chimneys combine to create an illusion of a cluster of houses or a village. Clayton constructed other exterior features from a variety of Texas stones, including granite and sandstone, all custom-cut on site.
The Gresham mansion was made all of stone, and was sturdy enough to withstand the great hurricane of 1900. The Greshams welcomed hundreds of survivors of the hurricane into their home.
In 1923 the Roman Catholic Diocese of Galveston purchased the house, and, situated across the street from the Sacred Heart Church, it served as the residence for Bishop Christopher E. Byrne. After the diocesan offices were moved to Houston, the diocese opened the mansion to the public in 1963, with proceeds from tours being used to help fund the UT medical school's Newman Center, which operated in the basement.
Bishop's Palace attained Recorded Texas Historic Landmark status in 1967. It was listed with the National Register of Historic Places in 1970 and was added to the Galveston East End Historic District in 1975.
The Galveston Historical Foundation acquired Bishop's Palace from the archdiocese in 2013 for $3 million. Most of the purchase price was funded by two large grants, one from the Moody Foundation for $1.5 million and the other from the Harris and Eliza Kempner Fund for $350,000.
The Foundation began a multi-million dollar renovation of Bishop's Palace in 2020, with the first phase including restoration of copper roof sections and a renovation of the conservatory. The next phase of restoration took place in 2025, with the building's failing 1920s tile roof replaced by an exact replica manufactured by Ludowici. In addition to new tiles Ludowici produced ornamental figurines to cap the rooftop, replacing originals lost since 1983.
Bishop's Palace has four floors. The raised basement which once housed the kitchen and servant's areas now contains the store. This basement is followed by three formal floors.