Galveston Island is believed to be approximately 5000 years old. It is generally believed Cabeza de Vaca and his crew were shipwrecked here in 1520. The LaFitte brothers, fleeing the prosecution of pirates in the United States, established a government here in 1817, with visions of creating a "Manhattan on the Gulf." Commerce did thrive here, but major storms in 1867, 1871, 1875, and 1886 greatly slowed progress. The great storm of 1900 devastated the island, killing 5000 to 10,000 people, and prompted the construction of the seawall which protects the northern half of the island.