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In page Ambohimanga:

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Andrianampoinimerina dethroned Andrianjafy in a violent conflict that ended in 1787. The king then used Ambohimanga as a launching point for a successful campaign to bring the twelve sacred hills of Imerina under his rule, including the hill city of Antananarivo, thereby reuniting the four quadrants of the divided Kingdom of Imerina under his sovereignty and putting an end to 77 years of civil war. To consolidate support for his rule, Andrianampoinimerina mobilized representatives of the numerous noble castes to participate in the most extensive effort yet to expand and fortify Ambohimanga. He ordered the construction of new city walls, gates and defensive trenches, as well as a rosewood palace called Mahandrihono, which he had built in the traditional style.[15]