" ▁and ▁were ▁then ▁trans pl anted ▁into ▁a ▁Sic ilian ▁milieu , ▁by ▁Bret ons ▁im pressed ▁by ▁the ▁already ▁other world ly ▁associations ▁of ▁the ▁great , ▁vol can ic ▁mountain ▁of ▁their ▁new ▁home . ▁Media eval ist ▁Roger ▁Sh erman ▁Lo om is ▁quotes ▁pass ages ▁from ▁the ▁works ▁of ▁Ger v ase ▁of ▁T il bury ▁and ▁Ca es arius ▁of ▁He ister bach ▁( dating ▁from ▁the ▁late ▁tw elf th ▁century ) ▁featuring ▁accounts ▁of ▁Arthur ' s ▁returning ▁of ▁a ▁lost ▁horse ▁which ▁had ▁st rayed ▁into ▁his ▁sub ter rane an ▁kingdom ▁beneath ▁Et na . ▁Ca es arius ▁quotes ▁as ▁his ▁authority ▁for ▁the ▁story ▁a ▁certain ▁canon ▁G odes cal cus ▁of ▁Bonn , ▁who ▁considered ▁it ▁a ▁matter ▁of ▁historical ▁fact ▁of ▁the ▁time ▁of ▁Emperor ▁Henry ' s ▁con quest ▁of ▁Sic ily ▁circa ▁ 1 1 9 4 . ▁Ca es arius ▁emp lo ys ▁in ▁his ▁account ▁the ▁Latin ▁phrase ▁in ▁mon te ▁Gy ber ▁(" with in ▁Et na ") ▁to ▁describe ▁the ▁location ▁of ▁Arthur ' s ▁kingdom . ▁ ▁The ▁F ada ▁de ▁Gib el ▁of ▁the ▁Castle ▁of ▁Gib ald ar ▁( F air y ▁of ▁Et na ) ▁appears ▁in ▁J auf re , ▁the ▁only ▁surv iving ▁Arthur ian ▁rom ance ▁in ▁the ▁Occ itan ▁language , ▁the ▁composition ▁of ▁which ▁is ▁dated ▁to ▁between ▁ 1 1 8 0 ▁and ▁ 1 2 3 0 . ▁However , ▁in ▁J auf