HBO has inked deals with several writers to join fantasy maestro George R.R. Martin in developing four Game of Thrones offshoot series, reports Deadline.

Max Borenstein (Godzilla, Kong: Skull Island), Jane Goldman (Kick-Ass, Kingsman, X-Men), Brian Helgeland (Mystic River, A Knights Tale), and Carly Wray (The Leftovers, Westword, Mad Man) all signed deals with HBO. No details on the offshoots were offered beyond noting that the new series would explore different eras in Martin’s intricate fantasy universe.

Dan Weiss and David Benioff, who produce the current Game of Thrones show, are attached to executive produce the new series alongside Martin.

Season 7, the penultimate season of the hit HBO series, kicks off July 16 (see “'Game of Thrones' Premiere Date Set”). On June 6, Dynamite will release the first issue in A Clash of Kings, the comic adaptation of the second novel in Martin’s Song of Ice and Fire series (see “'A Clash of Kings' Comes to Comics”).