In Masoudi’s time, the Kaïtak or Kaïdak inhabited the northern slopes of the Caucasus towards the Caspian Sea. There, also, Aboulfeda placed them, and there they are to this day. We have seen how futile were their endeavours to oppose Timour upon his last expedition against Toktamish, and that Romanists and Christians of other denominations soon afterwards introduced themselves amongst them; but that they had not discontinued their evil practices is proved by the bitter experience of the Russian merchant Nikitin, who was plundered when shipwrecked on their coast in 1468. It was in vain that he sought to recover his property, even though he appealed to Shirvan Shah, brother-in-law to Ali Bek their prince (Dorn, _Versuch einer Gesch. der Schirwan-Sch._, 582). The Kaïtak were a people of sufficient importance to have attracted the notice of Schiltberger, when he passed through their territory on his way from Persia to Great Tatary. Whilst in those parts, the author must have spent some time amongst the Nogaï of the tribes of Jambolouk or Yembolouk, as they are designated by Thunmann (Büsching, _Gr. Erdbeschr._, iv, 387), and who were so named because their earliest settlements were near the Jem or Yemba which flows into the Caspian. It was only towards the close of the 18th century that they moved to the western shores of the Sea of Azoff, where they met with other Nogaï, at a time that the territory was being annexed to the Russian empire. The wandering life of these Tatars, and their frequent internecine divisions, justify us in assuming that in Schiltberger’s time the greater number, if not the whole of the Jambolouks, had moved their encampments in a westerly direction, and this explains why the Tatar duke met by De Lannoy (_Voy. et Ambass._, 40) in 1421, who lived on the ground with all his people, was named Jambo. It was in the power of the descendants of that duke to remove to any other more convenient site; it is, therefore, very possible, that the fortress and town of Yabou, ceded in 1517 by the Crimean Khan to Sigismund of Poland, together with other places on the Dnieper, may have belonged to him (_Sbornyk_ by Prince Obolensky, i, 88). I feel that we are at liberty to infer from these several facts that the “Inbu” were Tatars of the Jambolouk Horde.—BRUUN.