Illuminationism (Persian حكمت اشراق hekmat-e eshrāq, Arabic: حكمة الإشراق ḥikmat al-ishrāq, both meaning "Wisdom of the Rising Light"), also known as Ishrāqiyyun or simply Ishrāqi (Persian اشراق, Arabic: الإشراق, lit. "Rising", as in "Shining of the Rising Sun") is a philosophical and mystical school of thought introduced by Shahab al-Din Suhrawardi (honorific: Shaikh al-ʿIshraq or Shaikh-i-Ishraq, both meaning "Master of Illumination") in the twelfth century, established with his Kitab Hikmat al-Ishraq (lit: "Book of the Wisdom of Illumination"), a fundamental text finished in 1186. Written with influence from Avicennism, Peripateticism, and Neoplatonism, the philosophy is nevertheless distinct as a novel and holistic addition to the history of Islamic philosophy. While the Ilkhanate-Mongol Siege of Baghdad and the destruction of the House of Wisdom (Arabic: بيت الحكمة, romanized: Bayt al-Ḥikmah) effectively ended the Islamic Golden Age in 1258, it also paved the way for novel philosophical invention. Such an example is the work of philosopher Abu'l-Barakāt al-Baghdādī, specifically his Kitāb al-Muʿtabar ("The Book of What Has Been Established by Personal Reflection"); the book's challenges to the Aristotelian norm in Islamic philosophy along with al-Baghdādī's emphasis on “evident self-reflection” and his revival of the Platonic use of light as a metaphor for phenomena like inspiration all influenced the philosophy of Suhrawardi. The philosopher and logician Zayn al-Din Omar Savaji further inspired Suhrawardi with his foundational works on mathematics and his creativity in reconstructing the Organon; Savaji's two-part logic based on "expository propositions" (al-aqwāl al-šāreḥa) and "proof theory" (ḥojaj) served as the precursory model for Suhrawardi's own "Rules of Thought" (al-Żawābeṭ al-fekr). Among the three Islamic philosophers mentioned in Suhrawardi's work, al-Baghdādī and Savaji are two of them. Upon finishing his Kitab Hikmat al-Ishraq (lit: "Book of the Wisdom of Illumination"), the Persian philosopher Shahab al-Din Suhrawardi founded Illuminationism in 1186.