Alexei (Kabalyuk) was a monk, hieromonk, and missionary who led the return of the Carpatho-Rusyn population of Transcarpathia to the Orthodox Church in the early twentieth century. Born in 1877 into the family of a lumberjack, he was raised in a Greek-Catholic (Uniate) milieu before embracing Orthodoxy, and his subsequent labors gave him the title Apostle of Carpatho-Russia. He is commemorated on December 2, the day of his repose in 1947.
After beginning monastic life as a novice in the Uniate monastery of Kish-Baranya, Alexei traveled to Mount Athos and entered the Russian Monastery of the Great Martyr Panteleimon, where he was received into the Orthodox Church. He was tonsured a monk on May 5, 1910 and ordained a hieromonk on August 15, 1910. Returning to his homeland, he preached among the Carpatho-Rusyn villages, and by 1912 the synaxarion records that about 35,000 Uniates had returned to Orthodoxy in such settlements as Iza, Velikiye Luchki, Yasinya, and Khust.
His missionary success drew the hostility of the Austro-Hungarian authorities. At the Marmaros-Sigoth trial of 1913–1914 he was accused of treason and imprisoned in the Thalerhof concentration camp together with other Carpatho-Russian Orthodox. He survived this persecution and continued his work, and in 1921 he was chosen igumen of the Saint Nicholas Monastery in Iza, later being elevated to archimandrite.
Alexei reposed on December 2, 1947. His relics were recovered in 1999, and he was canonized in 2001, recognized as the first Subcarpathian Russian Orthodox saint. He is venerated as the apostle and confessor of the Carpatho-Rusyn people.