Genealogy

Zherebtsov (Jerebzov): ЖЕРЕБЦОB
Feodor Biakont departed from Chernigov for Moscow in 1335 to serve the Grand Prince Ivan Danilovich Kalita. From him is descended the Pleshcheev family whilst, from his second son, Feofan Biakont, are descended the Zherebtsov family. Several served the Russian Throne in noble posts and were granted fiefdoms.
Alexander Zherebtzov Hereditary Commander (1799)
Dmitri Zherebtzov Hereditary Commander (1928)
Details awaited.
Sources:
Ferrand, Jacques: Les Familles Princières de l'Ancien Empire de Russie Recueil Généalogique, 2ème édition [Paris 1998]
Mandrich, Donald R. & Placek, Joseph A.: Russian Heraldry and Nobility [Dramco Publishers, Boynton Beach, Florida 1992]
Marek, Miroslav: GENEALOGY.EU - http://genealogy.euweb.cz/
Rietstap, J.B.: ARMORIAL GÉNÉRAL [2éme ed., G.B van Goor Zonen, Gouda 1884]
Shamà, Davide and Dominici Battelli, Andrea: GENEALOGIE DELLE DINASTIE ITALIANE - http://www.sardimpex.com
Theroff, Paul: An Online Gotha