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Dame Susannah Keate (nee Orlebar, circa 1629-1719) was the second wife of Sir Jonathan Keate, Baronet (1633-1700). In 1660, Sir Jonathan Keate was granted a baronetcy of the Hoo estate, Kimpton, in the hundred of Middlesex (note: this was an ancient form of administrative division; Middlesex is now a part of Greater London, with parts in other counties, such as the Hoo estate in Herfortshire). In 1665, he was appointed the first High Sheriff of Hertfordshire, a position he held until 1666. During the years 1679-1681, he served the county as a member of Parliament. From his first wife (also named Susannah), he acquired the land in which he became baronet. The first Dame Susannah Keate was the only daughter and heiress of the Hon. William Hoo, Esq. They had four children: Gilbert Hoo (or Gilbert-Hoo), Jonathan, Susan, and Elizabeth. Gilbert Hoo and his heirs succeeded Sir Jonathan in the baronetcy, but the line ended with Sir Jonathan's great-grandson, Sir William, in 1757 when he died unmarried. In 1732, the Hoo manor was sold by Sir Henry Hoo (or Henry-Hoo; father of William) and was subsequently turned into a private park and garden.

Susannah Orlebar was born of a prominent family. Her father, John Orlebar, was a woolen draper, and an eminent citizen of London. She married Sir Jonathan Keate after the death of his first wife. Much of the Hoo estate was bequeathed to the male heirs and many family members of Dame Keate. She also provided bequests for previous and current servants, and the poor of Kimpton village. She died in 1719.