Information from, "The History of the Stanhope Family" by Michael Stanhope, 2007. Website as at July 2014:
http://stanhopefamilyhistory.webs.com

Vicomte of the Vexin

Michael quotes that Gilbert Crispin I., was so named becuase, 'of the shape of his hair was to be known as Crispin. For in his early youth he had hair that was brush-like and stiff and sticking out, and in a manner of speaking bristling like the needles of a pine tree. This gave him the name of Crispin, from 'crispus pinus, 'pine hair'. Gilbert Crispin I. was also noted by Milo Crispin as being 'of renowned origin and nobility' [Milo Crispin, How The Holy Virgin Appeared To William Crispin The Elder And On The Origin Of The Crispin Family, ed. Migne, cols. 735-744, 1856].

Michael writes that Gilbert and Gunnor had five children:
1. Gilbert Crispin II
2. William Crispin I (alias of ‘de Colleville’)
3. Robert Crispin
4. Emma Crispin
5. Hesilia Crispin

Robert Crispin, having left Normandy wandered through many provinces until he arrived at Constantinople where he was welcomed with honour by the Emperor and made a name for himself with all, and where also, as is said, died of poison due to the envy of the Greeks'.