Davydov

Davydov (Davidov, Davidoff):  ДАBЫДОB

On a Maltese Cross arg and encircled by the collar of the Order of St John with its pendant:

Quarterly:
1 and 4. Gu an eagle displayed sa holding in its dexter claw a sword erect proper;
2 and 3. Az a longbow palewise in full draught aimed towards the outer side of the shield and in chief 3 mullets of 6 or placed 1, 2.²
Overall on an escutcheon az a crescent reversed arg between a crosslet and a mullet of 6 all or. On a chief gu a cross arg.¹ 

The Davydov Family Achievement²

Sources (Blazon):

1. Rietstap, J.B.: ARMORIAL GÉNÉRAL [2éme ed., G.B van Goor Zonen, Gouda 1884]

2. Mandrich, Donald R. & Placek, Joseph A.: Russian Heraldry and Nobility [Dramco Publishers, Boynton Beach, Florida 1992]

3. Unattributed