She brought Spilsby, and the Manor of Eresby, with her, those lands being gifted to her by William I. The manor was held by the Beke family until the male line died out, leaving Alice, the daughter of John Beke, 1st Baron Beke of Eresby, and the sole heiress of Walter, 2nd Baron Beke de Eresby, her brother who died in about 1310. The manor passed to Robert de Willoughby by way of his father William de Willoughby's marriage to Alice de Beke in about 1254. The Willoughby family originated in nearby Willoughby in the Marsh. In 1313, Robert was summoned to parliament as the first Baron Willoughby de Eresby, a family line that continues to the 28th Baroness Willoughby de Eresby. The original manor house from the 14th century stood near the site of the later mansion. It was probably demolished when the new manor was built. During excavations in the mid-1960s, fragments of the earlier dwelling were discovered. Many examples of medieval and post-medieval pottery shards were recovered from the site of the Eresby Manor's moat by archeologist E. H. Rudkin in 1966. The new Eresby manor house was built by Charles Brandon, 1st Duke of Suffolk, in 1535. He acquired the property after marrying his ward, the fifteen-year-old Catherine Willoughby, daughter and heiress of the William, 11th Baron Willoughby de Eresby. In 1769, the Manor House was destroyed by fire during the stewardship of the 19th Baron, who was also Duke of Ancaster and Kesteven. It is believed that a carpenter accidentally started a fire with his candle while he was working in the roof space. A 1771 plan shows that the house was built in an 'H' shape. The plan also shows details of the grounds, which included an orangery, cherry orchard, bowling green, dovecote, and an ash grove, all near to the house. The Manor House had originally been moated, but by 1771 the moat had been adapted as an ornamental fishing lake. The Church of England parish church of St James is built of the local Spilsby green sandstone. Parts of it date from the late 14th century, although it has been much added to over the centuries. The church has important funerary monuments. The greenstone is a soft and porous stone that absorbs water. The church was recased in Lancaster stone. It can seat a congregation of around 750. The parish churchyard was