San Nicola is where most of the population resides. It is the site of a monastery where a monk named Nicolò was buried. Legend has it that every time someone tried to move his corpse off the island, a violent storm would break out, preventing navigation around the island.
Capraia is deserted.
Cretaccio is a large block of clay and thus uninhabited.
Pianosa is a small, uninhabited island. Its maximum elevation is. Sometimes, during storms, the waves cover it.
History
Inhabited since late Iron Age times, the Tremiti Islands have been a confinement place since ancient times. Roman emperor Augustus had his granddaughter Julia the Younger transferred here, where she died after 20 years. In the Middle Ages the archipelago was ruled by the Abbey of Santa Maria a Mare at San Nicola island, apparently founded here in the 9th century by Benedictine monks from Montecassino. In the 13th century the abbey had gained its autonomy from the father monastery, and owned lands from the Biferno to Trani on the Apulian mainland. After an alleged period of moral decadence, in 1237 the Benedictines were replaced by the Cistercian order. In 1334 the abbey was sacked by Dalmatian pirates from Omiš. In 1412 the Lateran Canons took ownership of the islands, and restored the abbey with cisterns and fortifications which withstood the assault of Ottoman ships in 1567. The abbey was suppressed in 1783 by King Ferdinand IV of Naples, who set up a penal colony. During the Napoleonic age the islands were a stronghold of Joachim Murat's supporters, who resisted a British fleet in 1809. In 1843, to repopulate the islands, King Ferdinand II of Two Sicilies moved a number of people from Naples' slums to the islands, who mostly became fishermen. In 1911, about 1,300 Libyans who had resisted Italian colonial rule were confined to Tremiti. After a year, around one-third of them had died, mainly from typhus.
1930s
During the Fascist era, the archipelago continued to perform its function of confinement, detaining, among others, Amerigo Dumini, and future president of the Republic, Sandro Pertini. Mussolini had hundreds of homosexuals deported to San Domino, in 1938. No law prohibited homosexuality at the time, and Mussolini also denied its existence, saying that, "In Italy there are only real men". However, suspected or reported homosexuals were rounded up and deported. The conditions on the island were very difficult, and a few died. San Domino had the distinction of being the only internment camp in which all the prisoners were gay. Mussolini's regime had unwittingly created a part of Italy in which men were expected to be openly gay. The dormitories were spartan, with no electricity or running water. A bell would ring at 8 p.m. each day, signaling that the men were no longer allowed to be outside. For the remainder of the night they were locked in their dorm rooms, under police supervision. The internment camp closed in 1939, as Italy became enmeshed in the beginnings of World War II.
2000s
In May 2012 the provincial government caused a scandal by attempting to sell-off blocks of land on two of the islands for development for a reported €4m. Local environmental groups campaigned vigorously and in the event there were no bidders.