The 1st Guards Cavalry Division was a Guards cavalry division of the Imperial Russian Army.
The division had four regiments: His Majesty's Cuirassier Guards Regiment (Leib-Gvardii Kirasirskii Ego Velichestva Polk), Her Majesty's Cuirassier Guards Regiment (Leib-Gvardii Kirasirskii Eia Velichestva Polk), His Majesty's Cossack Guards Regiment (Leib-Gvardii Kazachii Ego Velichestva Polk), and the Ataman Cossack Guards Regiment of H. I. H. the Tsesarevich (Leib-Gvardii Atamanskii Ego Imperatorskago Vysochestva Naslednika TSesarevicha Polk).
References
1st Guards Cavalry Division (Russian Empire) Wikipedia(Text) CC BY-SA