The death of this person is the subject of scenes called guriz in otherwise secular performances. A charity whose name asks “Who is [this person]” organizes blood drives to commemorate this person, who also names a kind of building also called a takyeh (“tahk-YAH”) or imambara. The day that marks this person's death also commemorates Noah’s Ark landing on dry land and the parting of the Red Sea. Tasu’a commemorates (*) Abbas’s refusal to betray this man, the principal subject of passion plays called ta’ziyeh (“tah-zee-YAH”). A kind of self-flagellation called tatbir is practiced to honor this man, whose shrine is the subject of the Arba’een pilgrimage. The tenth day of Muharram, (-5[1])Ashura, commemorates this man, who died in the Battle (-5[1])of Karbala. For 10 points, name this third Shia imam, the son of Ali. ■END■ (10[1]0[4])