Shams-i Tabrīzī or Shams al-Din Mohammad was a Persian Shafi'ite poet, who is credited as the spiritual instructor of Mewlānā Jalāl ad-Dīn Muhammad Balkhi, also known as Rumi and is referenced with great reverence in Rumi's poetic collection, in particular Diwan-i Shams-i Tabrīzī. Wikipedia