"Sir William Thornburgh of Hamsfeld knight. He married Thomasin one of the four daughters and coheirs of Sir Robert Bellingham of Burneshead knight. ... The said Sir William, by his wife Thomasin Bellingham had issue, 1. William. 2. Rowland, who died without issue. 3. Margaret, married to Richard Fallowfield of Melcanthorp. 4. Nicholas, from whom the present family of Thornburghs of Selside are descended, ... 5. Thomasin, married to Hugh Dicconson of the county of Lancaster. 6. Cicely, married to John Wharton of Kirkby Thore. 7. Dorothy, married to Henry Middleton of Threlkeld."
Rowland is listed as the second son, probably because William was identified as Thomasin's eldest son in her will, whereas William was her eldest surviving son.
