By the time Andrianampoinimerina's son Radama I had ascended the throne upon his father's death in 1810, Antananarivo was the largest and most economically important city on the island, with a population of over 80,000 inhabitants. Radama opened the city to the first European settlers, artisan missionaries of the London Missionary Society (LMS) who arrived in 1820 and opened the city's first public schools. James Cameron introduced brickmaking to the island and created Lake Anosy to generate hydraulic power for industrial manufacturing. Radama established a military training ground on a flat plain called Mahamasina at the base of Analamanga near the lake. Radama's subjugation of other Malagasy ethnic groups brought nearly two-thirds of the island under his control. The British diplomats who concluded trade treaties with Radama recognized him as the "ruler of Madagascar", a position he and his successors claimed despite never managing to impose their authority over the larger portion of the island's south. Thereafter, Merina sovereigns declared Antananarivo the capital of the entire island.