A previous church on the site was built in 1866 by the order of the Governor-General of the Northwestern Krai Konstantin von Kaufman for the needs of the local garrison and was consecrated in honour of the emperor Constantine I and his mother Helena. Usually referred to as the Iron church (Железная церковь, Dzelzs baznīca) because of its external cladding, it was dismantled and rebuilt at Tsargrad (now Jersika), where it still remains, following the decision to build a new garrison cathedral at the original site.
The contemporary church was built in 1904–1905, the construction work being financed by the military. It was consecrated on 25 July [O.S. 12 July] 1905 in honour of the Holy Righteous Princes and Passion-bearers Boris and Gleb and Saint Alexius, Metropolitan of Moscow.
Architecture.
The church was built in the Neo-Russian style. It is a three-aisled masonry church, which on the plan forms an oblong rectangular with a polygonal apse and resembles a ship. The cathedral has ten towers with gilded cupolas. The interiors include murals and ceiling pieces.
It has been suggested that the icons on the oak iconostasis in the cathedral are copies of works by Viktor Vasnetsov in St. Vladimir's Cathedral, Kiev.