King Charles I made use of the King's Room during his visit in 1633 and Oliver Cromwell also stayed at the "Angel" after his successful battle near Grantham in 1643. The cellars and foundations of the inn are reputed to date from the 9th century, and are rumoured to be linked by tunnels to both St Wulfram's Church and the town's Market Square. In 1707 the then landlord Michael Solomon died, but left a legacy of 40 shillings a year to pay for the preaching of a sermon, against the evils of drunkenness, for every Mayor.