Sigulf 'the Thane' Gormsson

References

1. http://www.frøyaslekt.no/getperson.php?personID=I2616&tree=1&sitever=standard
2. “Forne Sigulfson – The ‘first’ lord of Greystoke in Cumbria” https://thewildpeak.wordpress.com/2013/03/30/forne-sigulfson-the-fi...
3. A New History of The SPOFFORTH Family", compiled by Capt. Ralph Spofforth, Yorkshire, UK, 1949. (A typewritten, unpublished family history) Page 1 < PDF > page 10