The Chronicles of Prydain
The series includes: "The Book of Three" ( 1964 ) , "The Black Cauldron" ( 1965 ) , "The Castle of Lyr" ( 1966 ) , "Taran Wanderer" ( 1967 ) , and "The High King" ( 1968 ) . 
<triplet> The Book of Three <subj> "The Black Cauldron" <obj> followed by <triplet> "The Black Cauldron" <subj> "The Castle of Lyr" <obj> followed by <triplet> "The Castle of Lyr" <subj> Taran Wanderer <obj> followed by <triplet> Taran Wanderer <subj> "The Castle of Lyr" <obj> follows <subj> The High King <obj> followed by <triplet> The High King <subj> Taran Wanderer <obj> follows