Ad-Din in the context of "Arabic definite article"

The Five Pillars of Islam (arkān al-Islām أركان الإسلام; also arkān ad-dīn أركان الدين "pillars of the religion") are fundamental practices in Islam, particularly Sunni Islam, considered to be obligatory acts of worship for all Muslims. They are summarized in the hadith of Gabriel. The Sunni and Shia agree on the basic details of the performance and practice of these acts, but Shia denominations may have their own lists of pillars that differ from the Sunni five, such as the Twelver Ancillaries of the Faith (consisting of four pillars and six obligatory acts) and the Ismaili Seven Pillars. The five pillars are: profession of faith (Shahada), prayer (Salah), almsgiving (Zakat), fasting in the month of Ramadan (Sawm), and pilgrimage to Mecca (Hajj).

Sayf ad-Din Qutuz (Arabic: سيف الدين قطز; died 24 October 1260), also romanized as Kutuz or Kotuz and fully al-Malik al-Muẓaffar Sayf ad-Dīn Quṭuz (الملك المظفر سيف الدين قطز lit. 'The Victorious King, Sword of the Faith Qutuz'), was the Mamluk Sultan of Egypt. He reigned as Sultan for less than a year, from 1259 until his assassination in 1260, but served as the de facto ruler for two decades.

Sold into slavery in Egypt, he rose to become vice-sultan for more than 20 years, becoming the power behind the throne. He was prominent in defeating the Seventh Crusade, which invaded Egypt in 1249–1250. When Egypt was threatened by the Mongols in 1259, he took control of the military and deposed the reigning sultan, 15-year-old Sultan Al-Mansur Ali. The Mongols conquered the centers of Islamic power in Syria and Baghdad, and the center of the Islamic Empire moved to Egypt, which became their next target. Qutuz led an Egyptian Mamluk army north to confront the Mongols, who had made a pact with Egypt's long-time enemy, the Crusaders.