What was the first tragedy play written in English?

The first tragedy play written in English is generally considered to be "Gorboduc," also known as "Ferrex and Porrex," which was penned by Thomas Norton and Thomas Sackville in 1561. This play is notable for its use of blank verse and its themes of power, betrayal, and familial conflict. It marked a significant development in English drama, paving the way for future tragic works.