He is generally considered by historians to be the founder of the Kingdom of Imerina and originator of the Merina royal line that, by the 19th century, had extended its rule over virtually all of Madagascar.
Numerous cultural traditions, including the ritual of circumcision, the wedding custom of vodiondry and the art of Malagasy astrology (sikidy) are likewise associated with this king.
Andriamanelo was the oldest son of the reigning Vazimba queen (alternately given in the oral histories as Rafohy or Rangita) and her Hova husband Manelobe, who may have had origins in the Zafiraminia people of Anosy.
In a bid to counteract further fracturing of their kingdom, Rafohy and Rangita decided that while the Vazimba had historically been ruled by queens, Andriamanelo would inherit the crown upon his mother's death and would be succeeded not by his own child but by his younger brother.
[3] Among the distinguishing features of Andriamanelo's reign was the expansion of his territory around the sacred hill of Alasora through a military campaign against the Vazimba to push these legendary, primitive first settlers of Madagascar toward the west of the island.
[4] Popular legend attributes Andriamanelo's military successes to several innovations, including the discovery of iron smelting and propagation of the iron-tipped spear [5] against the Vazimba who fought with weapons of clay.
However, his attempt to establish Merina dominance in the central Highlands was thwarted when he proved unable to seize Analamanga;[4] this Vazimba stronghold would not fall until at last conquered by Andriamanelo's grandson, Andrianjaka.
[4] Ramaitsoanala took the name Randapavola upon her marriage and then became known as Queen Rasolobe upon the birth of the couple's seventh and final son, Ralambo—the only one of Andriamanelo's children to survive to adulthood.
[11] Andriamanelo's antecedents, Rafohy and Rangita, had jointly decreed a system of social order whereby the designated heir should have a younger sibling who would succeed him.
[citation needed] Andriamanelo was also reportedly the first to formally establish the andriana as a caste of Merina nobles, thereby laying the foundation for a stratified and structured society.
According to oral history, after the sovereign had successfully contracted a marriage with Ramaitsoanala, sole daughter of Vazimba King Rabiby, Andriamanelo sent her a variety of gifts including vodiondry—meat from the hindquarters of a sheep—which he believed to be the tastiest portion.