Name
- Siccus, Nicolaus1
- Siddons, Sarah, of Add MS 121161
- Sidney, Henry, President of the Council in Wales, etc1
- Sidney, Robert, 2nd Earl of Leicester 16261
- Sidney, Robert, Lord Sidney, Viscount Lisle and Earl of Leicester1
- Sigonio, Carlo, of Add MS 121101
- Sixtus I, Pope1
- Sixtus V, Pope1
- Smith, Sydney, Reverend Canon of St Paul's, 1771-1845, http://viaf.org/viaf/131038031
- Smythe, Percy Clinton Sydney, 6th Viscount Strangford, diplomatist, 1780-18551
- Sobieski, John III, King of Poland, 1629-16961
- Somers, John, Baron Somers, lawyer and politician, 1651-17161
- Southwell, Edward, Right Hon; son of Sir Robert Southwell1
- Sovereigns of France1
- Spoleto, Nicolaus1
- Spragg, Edward1
- Stanilaus Poniatowsky, King of Poland1
- Stephanus, of Add MS 119641
- Stephen, Saint, First Martyr1
- Stewart, James, Earl of Moray, Regent of Scotland1