[1] Hamo Ohanjanyan was born in 1873 in the Armenian-majority town of Akhalkalak (modern-day Akhalkalaki, Georgia) in the Tiflis Governorate of the Russian Empire.

[4] At the 4th congress of the ARF in Vienna in 1907, he was a supporter of the "Caucasian program" which called for the party to engage in revolutionary activities against the tsarist authorities.

There he met back with Sophie Areshian, a fellow Armenian revolutionary, whom he married[5] and with whom he would have one son, Vigen (born 1920 in Yerevan).

[3] In November 1917, he was elected a member of the Russian Constituent Assembly (which formed following the February Revolution) and served as commissar for public welfare of the Transcaucasian Commissariat.

[4] In May 1918, Ohanjanyan's eldest son from his first marriage, Monik, was killed while fighting against invading Ottoman forces in the Battle of Karakilisa.

[4] After the resignation of Khatisian's government following the Bolshevik uprising of May 1920, Hamo Ohanjanian became prime minister, leading what is referred to as the bureau-government, as it consisted almost entirely of members of the ARF's top executive body, the party Bureau.

[7] After this victory, the Armenian army went on to defeat Muslim rebels in districts near Yerevan and advance toward Nakhichevan by the end of July 1920.

[9] In September 1920, Kemalist Turkey invaded Armenia, and after a series of crushing defeats, Ohanjanyan's government resigned on 23 November 1920 to allow another cabinet led by Simon Vratsian to negotiate peace terms.