FX is adding another project to its growing slate of event limited series. The cable network is developing Conquistadors, an adaptation of the Kim MacQuarrie book Last Day Of The Incas. Written by producer Nicholas Osborne in his writing debut, Conquistadors tells the story of Francisco Pizarro and Diego de Almagro, two Spanish Conquistadors who above all odds conquered the Incan empire of 10 million with just 168 men, and Manco Inca and Cura Occlo, two teenage Incan royal lovers, who led one of the greatest rebellions in history. Osborne is executive producing with Scott Rosenbaum, who serves as showrunner, and Underground Films’ Trevor Engelson.

Limited series development has been a priority for FX since the cable network announced its entry into the space in October. FX just greenlighted its first limited series, an adaptation of Joel and Ethan Coen’s 1996 feature Fargo. Additionally, FX last week announced several other high-profile limited/miniseries projects in development as the genre is poised to become a cornerstone for FX’s sibling FXM (Fox Movie Channel): Grand Hotel from Sam Mendes, about a fictional terrorist plot in Paris; Sutton, from Alexander Payne and Michael De Luca, about the infamous bank robber; Mad Dogs, from The Shield‘s Shawn Ryan, based on the British black comedy/psychological thriller miniseries; and Mayflower, from producers Paul Giamatti and Gil Netter. They are being joined by They Marched Into Sunlight, a six-part limited series executive produced by Oscar winner Stephen Gaghan.