The fallen numbered up to 1.5 million Armenians murdered a century ago at the hands of Ottoman Turks.

To mark what’s billed as the 100+1 Anniversary of the Armenian Genocide, thousands will march or bow their heads from Glendale to Montebello on Saturday and Sunday, while others will rally outside the Turkish Consulate in Los Angeles.

They will commemorate what they describe as an Armenian Genocide from 1915 to 1923 by an Ottoman Turkish government that deported and exterminated its Armenian subjects from what now constitutes the Republic of Turkey.

They say the slaughter began on April 24, 1915, when Ottoman authorities rounded up and arrested some 250 Armenian intellectuals and community leaders in Constantinople. This was followed by mass death marches into the Syrian desert in what’s now considered the first genocide of the 20th Century.

Modern Turkey denies a genocide ever occurred.

This weekend, four Armenian Genocide commemorations will be held across the region:

•A Montebello Armenian Genocide Commemoration, sponsored by the United Armenian Council of Los Angeles, at 1 p.m. Saturday at the Armenian Genocide Martyrs Monument, 901 Via San Clemente, Montebello.

•An Armenian Genocide Candlelight Vigil, sponsored by Unified Young Armenians, at 6:30 p.m. Saturday at Glendale City Hall, Parcher Plaza, 633 E. Broadway, Glendale.

•An Armenian Genocide Commemoration March, sponsored by Unified Young Armenians, at 10 a.m. Sunday, at the intersection of Hobart and Hollywood Boulevards in Little Armenia, Hollywood

•A rally for Justice at the Turkish Consulate, sponsored by the Armenian Genocide Committee, at 1 p.m. Sunday at 6300 Wilshire Boulevard, Los Angeles.