Haifa is first mentioned historically around the 3rd century CE as a small town near Shikmona, the main Jewish town in the area at that time and a center for making the traditional Tekhelet dye used for Jewish Priests' temple cloth. The archaeological site of Shikmona lies southwest of the modern Bat Galim neighborhood. The Byzantine ruled there until the 7th century, when the city was conquered — first by the Persians, then by the Arabs. In 1100, it was conquered again by the crusaders after a fierce battle with its Jewish and Muslim inhabitants. Under crusader rule, the city was a part of the Principality of Galilee until the Muslim Mameluks captured it in 1265.In 1761 Daher El-Omar, Bedouin ruler of Acre and Galilee, destroyed and rebuilt the town in a new location, surrounding it with a thin wall. This event is marked as the beginning of the town's modern era. After El-Omar's death in 1775, the town was under Ottoman rule until 1918, except for two brief periods. In the years following, Haifa grew in terms of traffic, population and importance, as Akko suffered a decline. The development of Haifa increased further with the arrival of members of the Temple Society in 1868, who settled a modern neighbourhood near the city, now known as the "German Colony". The Templers greatly contributed to the town's commerce and industry, playing an important role in its modernization.By the beginning of the 20th Century, Haifa had emerged as an industrial port city and growing population center, reflected by the establishment of facilities like the Hejaz railway and Technion. At that time Haifa District was home to approximately 20,000 inhabitants, comprised of 82% Muslim Arab, 14% Christian Arabs, and 4% Jewish residents. The Jewish population increased steadily with immigration primarily from Europe, and by 1945 the population had shifted to 38% Muslim, 13% Christian and 47% Jewish.Today, Haifa is home to significant populations of Jews, Muslim and Christian Arabs, Ahmadis (in Kababir), Druze (in Daliyat al-Carmel), Bahá'ís, and others, and has often been characterised as a mosaic of peaceful coexistence between the communities. The city has an industrial area to the north, where one of Israel's two oil refineries is located, and a high-tech south, where R&D Centers are located for a large number of Israeli and international hi-tech companies including Intel, Elbit, Zoran, Microsoft, Philips, Google and Amdocs. IBM has R&D labs on top of Mount Carmel at Haifa University and HP has a lab at the Technion, one of Israel's leading technological universities. http://wikitravel.org/en/Haifa