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Archaeological evidence suggests that Egypt was at least partially unified during the reigns of Ka and Iry-Hor (Narmer's immediate predecessors), and perhaps as early as Scorpion I (several generations before Iry-Hor). Tax collection is probably documented for Ka and Iry-Hor. The evidence for a role for Scorpion I in Lower Egypt comes from his tomb Uj in Abydos (Upper Egypt), where labels were found identifying goods from Lower Egypt. These are not tax documents, however, so they are probably indications of trade rather than subjugation. There is a substantial difference in the quantity and distribution of inscriptions with the names of those earlier kings in Lower Egypt and Canaan (which was reached through Lower Egypt), compared to the inscriptions of Narmer. Ka's inscriptions have been found in three sites in Lower Egypt and one in Canaan. Iry-Hor inscriptions have also been found in two sites in Lower Egypt and one in Canaan. This must be compared to Narmer, whose "serekhs" have been found in ten sites in Lower Egypt and nine sites in Canaan (see discussion in "Tomb and Artefacts" section). This demonstrates a qualitative difference between Narmer's role in Lower Egypt compared to his two immediate predecessors. There is no evidence in Lower Egypt of any Upper Egyptian king's presence before Iry-Hor. The archaeological evidence suggest that the unification began before Narmer, but was completed by him through the conquest of a polity in the North-West Delta as depicted on the Narmer Palette.