[Illustration: Arikara attack on Ashley Party, 1823.] This is the core of the tradition. From this it has generally been inferred that it was on this occasion that the lake and the valley were named in honor of David E. Jackson, and that this was Captain Sublette’s idea. David E. Jackson, sometimes referred to as “Davey,” is the mystery man of the Smith-Jackson-Sublette trio. How old he was, what he looked like, where he came from prior to 1823 is not known. He was one of the “enterprising young men” who responded to Ashley’s call in that year. That his “rating” with trappers was high and that he was one of the acknowledged leaders of the Rocky Mountain fur trade is clear from the fact of the partnership formed in 1826. He was not illiterate, for his signature appears on documents, but like most of his associates he kept no diary, so that our knowledge of his exact wanderings is indistinct. It is part of the tradition that he spent the winter of 1828-29 in the vicinity of Jackson’s Hole, and his known interest in the region prompts us to believe that he had spent several previous years there as well. He might well have been one of the six men who accompanied Smith on his “discovery” of Jackson Hole in 1824. He left the mountains in 1830, went to Santa Fe and then on to California on a trading venture in 1831, and apparently returned to St. Louis in 1832, where he disappears, so to speak, under a cloud. One rumor has it that he “ran off with property belonging to the firm of Jackson, Waldo and Young,” another that “he dissipated his large and hard-earned fortune in a few years.” After the reunion in Pierre’s Hole, according to Meek, the entire company moved up Henry’s Fork of the Snake, and across the Divide to the valleys of the Madison and Gallatin. Crossing the Gallatin Range in early winter, the trappers reached the vicinity of Cinnabar Mountain, three miles below Yellowstone Park’s present North Entrance. Here two men were killed and the party was scattered by the Blackfeet. Meek alleges that he wandered into the future Park, where he ascended a high peak. Crossing Yellowstone River, he ran into an incredible region smoking “like Pittsburgh on a winter morning” with the vapor from boiling springs, haunted by the sound of whistling steam vents, dotted with cone-shaped mounds surmounted by craters from which issued “blue flames and molten brimstone,” and devoid of living creatures. From here, apparently the seldom visited Mirror Plateau, Meek crossed the Absaroka Range to the winter camp on Powder River. About the first of April 1830, according to Meek, “Jackson, or ‘Davey,’ as he was called by his men, with about half the company, left for the Snake country.” At the Wind River rendezvous in July, “Jackson arrived from the Snake country with plenty of beaver....”