Task: Question Generation
Input (English): In parallel, however, the 19th century saw a Catalan literary revival (Renaixença), which has continued up to the present day. This period starts with Aribau's Ode to the Homeland (1833); followed in the second half of the 19th century, and the early 20th by the work of Verdaguer (poetry), Oller (realist novel), and Guimerà (drama).
Output (English): When did this revival period begin?