Sir Guylford Slingsby (1565–1631) was an administrator who went on to be Comptroller of the Navy; he produced a number of distinguished sons.

[2] Slingsby was appointed Comptroller of the Navy following the death of Sir Henry Palmer in 1611.

[3] The position of Comptroller was placed in the hands of a commission from 1618 to 1628 when Slingsby resumed control.

[5] He married Margaret Walter of York; they had eight sons[2] most of whom reached adult life.

Margaret was still living in York in 1650 with her son Robert, who in that year "compounded" to keep part of the family estates in return for paying the usual fine levied on defeated Royalists.