R.H. Allen , Starnames, Their Lore and Meaning, , [1990], 99, Arcturus ... And it is the popularly supposed that our Arcturus is that of the Book of Job, xxxviii, 32; but there it merely is one of the early titles of Ursa Major, the Revised Version correctly rendering it "the Bear". Still, even now, the Standard Dictionary quotes for the star the Authorized Version's "Canst thou guide Arcturus with his sons?" But, like other prominant stars, it shared its name with its constellation -- in fact, probably at first, and as late as Pliny's day, was a constellation by itself.
R.H. Allen , Starnames, Their Lore and Meaning, , [1990], 101, John de Wiclif, in his translation of Amos, v, 8, in 1383, had it Arture, which he took from the Vulgate's Arcturus for Ursa Major; but John of Trevisa in 1398 more correctly wrote: Arthurus is a signe made of VII starres, . . . but prperly Arthurus is a sterre sette behynde the tayle of the synge that hyght Vrsa maior.