 Robert Adams is known primarily for his post-apocalyptic fiction.His first book "Coming of the Horseclans", published in 1975, was the first of his post-apocalyptic works that drew in readers, and launched his entire "Horseclans" series.The series is notable for having a detailed world and labyrinthine timeline (many of his "Horseclans" books are so cross-referenced that they make sense only when read in sequential order).