Son of Ștefan Baltagă, a priest, Alexandru followed the primary school in his home village of Lozova, Lăpușna County, Bessarabia, then under Russian rule.

On June 15, 1883, he graduated with distinction from the Chișinău Theological Seminary, the capital of Bessarabia, after which he worked for two years in the same city as a teacher at the Teological School for Boys.

On July 1, 1935, he was retired, but the Metropolis of Bessarabia and the Romanian Ministry of Education and Religious Affairs, through a special decree, offered him the exceptional right of serving until death in the Călăraşi-Sat parish.

From 1908 on, he was one of the key aides of Gurie Grosu in the editing and printing of the Romanian language Bessarabian religious journal Luminătorul.

[1][2][4][5][6][7] On the background of the dissolution of the Russian Empire, the Diocesan Congress in Chișinău (November 21–27, 1917 / December 4–10, 1917), elected him as a representative of the Bessarabian priesthood in Sfatul Țării.

The following night, they snatched him from his bed, and without allowing him to dress, took him to Chișinău, where he was subjected to interrogation in the cellars of the NKVD building.

After the Romanian Army crossed back into Bessarabia in early July 1941, the Soviets moved him to the interior of the USSR.

[1][7][10] In October 1995, the Adunarea Eparhială of the Metropolis of Bessarabia proposed investigative research on Alexandru Baltagă's life, with a view toward canonisation.