Why did Antananarivo become the capital of the Merina kingdom?

Antananarivo became the capital of the Merina kingdom following its founding in the 17th century, serving as a central seat for the Hova chiefs.12

The city's strategic importance was solidified when it was captured by Imerina kings in 1794. Situated on a high hill, the location provided a commanding position that allowed the monarchy to establish the Royal Estate, which featured prominent palaces. While the Merina kingdom itself originated in the nearby swampy Ikopa valley toward the end of the 16th century, Antananarivo’s elevation and development as a fortified royal center made it the enduring political heart of the kingdom as it expanded across the central plateau of Madagascar.12