The Lighthouse of Alexandria, sometimes called the Pharos of Alexandria, was a lighthouse built by the Ptolemaic Kingdom of Ancient Egypt, during the reign of Ptolemy II Philadelphus (280–247 BC). It has been estimated to have been at least 100 metres (330 ft) in overall height. One of the Seven Wonders of the Ancient World, for many centuries it was one of the world's tallest man-made structures. The lighthouse was severely damaged by three earthquakes between AD 956 and 1303 and became an abandoned ruin. It was the third longest-surviving ancient wonder, after the Mausoleum at Halicarnassus and the extant Great Pyramid of Giza, surviving in part until 1480, when the last of its stones was used to build the Citadel of Qaitbay on the site. In 1994, a team of French archaeologists dived in the water of Alexandria's Eastern Harbour and discovered some remains of the lighthouse on the sea floor. In 2016, the Ministry of State of Antiquities in Egypt had plans to turn submerged ruins of ancient Alexandria, including those of the Pharos, into an underwater museum.
In 2025, parts of the lighthouse's entrance, threshold stones, and foundation paving stones were resurfaced to aid in a digital reconstruction effort intended to help scholars with architectural reconstructions.
Origin Pharos was a small island on the western edge of the Nile Delta. In 332 BC, Alexander the Great founded the city of Alexandria on an isthmus opposite Pharos. Alexandria and Pharos were later connected by the Heptastadion, a mole spanning more than 1,200 metres (0.75 miles). The east side of the mole became the Great Harbour, now an open bay; on the west side lay the port of Eunostos, with its inner basin Kibotos now vastly enlarged to form the modern harbour. Today's city development between the present Grand Square and the modern Ras el-Tin quarter is built on the silt which gradually widened and obliterated this mole. The Ras el-Tin promontory, where Ras el-Tin Palace was built in the 19th century, represents all that is left of the island of Pharos, the site of the lighthouse at its eastern point having been weathered away by the sea.
Construction
Maritime navigation to Alexandria was dangerous due to the northern coast of Africa's inconspicuous flat shores, shallow shoals, and submerged reefs. The lighthouse was constructed in the third century BC. After Alexander the Great died, Ptolemy the First (Ptolemy I Soter) declared himself king in 305 BC and commissioned its construction shortly thereafter. The building was finished during the reign of his son, Ptolemy II Philadelphus, and took twelve years to complete at a total cost of 800 talents of silver. The light was produced by a furnace at the top, and the tower was said to have been built mostly with solid blocks of limestone and granite. In his encyclopedic manuscript Geographica, Strabo, who visited Alexandria in the late first century BC, reported that Sostratus of Cnidus had a dedication to the "Saviour Gods" inscribed in metal letters on the lighthouse. Writing in the first century AD, Pliny the Elder stated in his Natural History that Sostratus was the architect, although this conclusion is disputed. In his second century AD educational treatise How to Write History, Lucian claimed that Sostratus hid his name under plaster which bore the name of Ptolemy, so that when the plaster eventually fell off, Sostratus's name would be visible in the stone. The blocks of sandstone and limestone used in the construction of the lighthouse have been scientifically analysed to discover where they originated, with mineralogical and chemical analysis pointing to the Wadi Hammamat quarries, in the desert to the east of Alexandria.
Height and description
Arab descriptions of the lighthouse are consistent despite it undergoing several repairs after earthquake damage. Given heights vary only fifteen percent from 103 to 118 m (338 to 387 ft), on a 30 by 30 m (98 by 98 ft) square base. The Arab authors indicate that the lighthouse was constructed from large blocks of light-coloured stone. The tower was made up of three tapering tiers: a lower square section with a central core; a middle octagonal section; and, at the top, a circular section. Al-Masudi wrote in the 10th century that the seaward side featured an inscription dedicated to Zeus. Geographer Al-Idrisi visited the lighthouse in 1154 and noted openings in the walls throughout the rectangular shaft with lead used as a filling agent in between the masonry blocks at the base. He reckoned the total height of the lighthouse to be 300 dhira rashashl (162 m). At its apex was a mirror which reflected sunlight during the day; a fire was lit at night. Extant Roman coins struck by the Alexandrian mint show that a statue of Triton was positioned on each of the building's four corners, and a statue of Poseidon or Zeus stood on top. The fullest description of the lighthouse comes from Arab traveller Abou Haggag Youssef Ibn Mohammed el-Balawi el-Andaloussi, who visited Alexandria in 1166. Balawi provided a description and measurement of the interior of the lighthouse's rectangular shaft. The inner ramp was described as roofed with masonry at 7 shibr (189 cm, 6.2 ft), noted as to allow two horsemen to pass at once. In clockwise rotation, the ramp held four storeys with eighteen, fourteen, and seventeen rooms on the second, third, and fourth floors, respectively. Balawi reported the base of the lighthouse to be 45 ba (30 m, 100 ft) long on each side with connecting ramp 600 dhira (300 m, 984 ft) long by 20 dhira (10 m, 32 ft) wide. The octagonal section was 24 ba (16.4 m, 54 ft) in width, and the diameter of the cylindrical section 12.73 ba (8.7 m, 28.5 ft). The apex of the lighthouse's oratory was measured with diameter 6.4 ba (4.3 m 20.9 ft). Later accounts of the lighthouse after the destruction by the 1303 Crete earthquake include Ibn Battuta, a Moroccan scholar and explorer, who passed through Alexandria in 1326 and 1349. Battuta noted that the wrecked condition of the lighthouse was then only noticeable by the rectangle tower and entrance ramp. He stated the tower to be 140 shibr (30.8 m, 101 ft) on each side. Battuta detailed Sultan An-Nasir Muhammad's plan to build a new lighthouse near the site of the collapsed one, but these went unfulfilled after the Sultan's death in 1341.
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