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Santorini was formed by a series of volcanic eruptions that affected the whole Aegean Sea and all the way to Crete. Originally, the island was named Kallisti (the beautiful one) and Strongyli ( the round one). Many people inhabited the island, starting from the Pre-Hellenes, then the Phoenicians and Dorians, who named the island Thira, after their King Thiras. During the 16th century BC, The Minoans settled on the island, which became an important center of the Minoan civilization

Around 1550 – 1500 BC a violent volcanic explosion caused the central part of Santorini, creating a huge basin of 83 square miles, called the Caldera During the Persian Wars, the island sided with the Athenian Alliance. Later Santorini came under the rule of Sparta.

In the Byzantine Era and under the rule of Constantinople, Santorini adopted the Cristian faith and appointed its own bishop, and organized its Cristian church. In 1204 AD, after the Fall of Constantinople, the Venetians took over the island, and it was during this time that the island was named Santorini, after Santa Irina. In 1207, Santorini was handed over to the Duke of Naxos and although it was taken by the Greeks for a short while, it remained under Venetian Rule until 1579, when the island came under Ottoman Rule. It had relative autonomy during this period, to the point that Santorini had an elected delegate who represented the Santorinians before the Turkish Authorities. The island finally gained its independence in 1821 and joined the Greek Republic in 1830 with the signing of the London Protocol.
In 1956, another severe volcanic eruption caused much destruction on Santorini, but the island has managed to re-build and develop into one of the most popular and well-loved vacation spots in the world.

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Santorini is a volcanic island group at the central south end of the Cyclades in the Aegean Sea. As a popular tourist destination in Greece, it is renowned for its spectacular sea-filled volcanic caldera surrounded by steep colorful cliffs, the beauty of its villages and fields.

The island group of Santorini is the most well-known and active volcanic center of the Hellenic Volcanic Arc in the south Aegean Sea. It is a very complex stratovolcano dominated by a large, sea-flooded caldera created by several large explosive eruptions. The different products of about 2 million years of volcanic activity have accumulated around a small non-volcanic basement, that once formed a small island similar to the other Cyclades islands. Most of the volcanic layers are visible in the multi-colored sequences of the impressive steep inner walls of the caldera, striking the visitor who reaches the island by boat. The last eruption took place in a phreatic eruption on Nea Kameni island in 1950.

The Minoan Eruption
Santorini’s volcanic activity during the past 2-500,000 years has been dominated by the very largest explosive eruptions at intervals of few tens of thousands of years. The most recent of this type occurred at around 1613 BC and is known as the so-called Minoan Eruption. The late Bronze Age eruption, one of the biggest known volcanic explosions in a younger time and one of the most studied, but still most mysterious eruptions of all time, devastated not only Santorini but had a deep impact on the whole of the Eastern Mediterranean. Perhaps it even had serious worldwide effects and changed history.

Still today, one can see its deposits, the characteristic, tens of meters thick layer of white pumice and ash that blankets most of the surface of the island group. The eruption changed the shape of the island itself dramatically: it is now believed that before the eruption, it had the shape of an almost complete ring that enclosed an earlier, shallower caldera. Then, large sections of the island collapsed into the emptied magma chamber after the eruption, literally disappearing under the sea. The ring-island was breached to the W and NW, and the caldera was significantly widened and deepened.
The Minoan eruption devastated the rich, highly developed economic center, that Santorini was at that time. Since 1969, intense archaeological excavations have brought to light an important Cyclades / Minoan town that had been buried beneath the volcanic ash for almost 4000 years. Although it appears that people had time to evacuate their island in time before the eruption, carrying most of their goods with them, the findings from Akrotiri are impressive: especially, they include well-preserved and magnificent wall paintings, ceramics, and other objects. Thanks to the work of numerous archeologists, a new light was thrown on an important prehistoric period and culture. The spectacular discovery even induced continuing speculations that relate the volcanic destruction of Santorini to the legend of the sunken Atlantis.

The historic eruptions of Santorini volcano (Palea and Nea Kameni).
Although at present dormant, Santorini has been active several times in historic time. Since its last major explosive eruption (at about 1645 BC) numerous minor and medium-sized, mainly effusive eruptions have occurred. This activity built the dark-colored islands of Nea and Palea Kameni inside the caldera. Their first appearance was witnessed and reported by Greek and Roman writers. The last eruption on Nea Kameni occurred in 1950. At present, Santorini is dormant, and volcanism manifests as fumaroles activity and hot springs around the islands.

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