A Shi'ite pilgrim takes part in a ritual commemorating the death anniversary of Imam Moussa al-Kadhim in Baghdad's Kadhimiya district June 4, 2013. Every year, thousands of Shi'ite pilgrims gather at the shrine to commemorate the death of Imam Moussa al-Kadhim, one of the 12 imams of Shi'ite, who was imprisoned for four years and poisoned by the then ruler Harun al-Rashid in 795 AD. REUTERS/Saad Shalash (IRAQ - Tags: ANNIVERSARY RELIGION)