We have no idea why Kamehameha V agreed on selling the island to Eliza in the first place. In 1864, Elizabeth Sinclair bought the Niihau island from the Kamehameha V for $10,000 which she paid in gold. But there was one condition that the king put in front of Eliza that changed the fate of the family and the island. The condition was tough but still, Elizabeth was tired of traveling and she agreed on that one condition. So what was the condition?