Salisbury Square

The square is named after Salisbury Court, by and on part of the land, today the name of the narrow street which leads the square from the north. Salisbury Court was the medieval London house and episcopal court of the Bishop of Salisbury, beside or above which he maintained a well-appointed inn for visitors.
Between 1629 and 1666 a relatively long-lived theatre stood on its south side. The original building, repaired and altered, became Dorset House, as having been repossessed for Elizabeth I, Salisbury Court was taken by her Chancellor of the Exchequer Richard Sackville, scion of the Earls of Dorset for himself and his heirs. His great-grandson, Edward Sackville, 4th Earl of Dorset was the main promoter of the theatre and a patron of performing arts. The grounds and outbuildings of Dorset House, London included the nascent square.

Wikipedia