An honest account of love, betrayal and an impending revolution, Norma (written in 1831 by Vincenzo Bellini with a libretto by Felice Romani) is filled with clashing cultures, romantic intrigue and despair. The Dallas Opera hosts the masterpiece for the first time at 7:30 p.m. Friday, April 21, at the Winspear Opera House, 2403 Flora St. The opera tells the tale of a love triangle set during the Roman occupation of Gaul in 50 B.C. The title character and Druid high priestess (soprano Elza van den Heever) finds out her lover, a Roman proconsul (tenor Yonghoon Lee), has been unfaithful. Insanity ensues. Tickets for the show, which has a handful of performances through May 7, start at $19 and can be purchased at dallasopera.org.