Kageyasu (景安) is a swordsmith of the lineage active in Province during the early period. Swordsmith compendia such as the Kokon Meizukushi classify him within the group and record him as a son of Kagehide, placing him alongside smiths such as Kagehide and Kagenori. However, as the has consistently observed, "the workmanship of the and , as well as the manner in which appears, are in the mode; judged from the style of the work, the theory does not hold." While it remains "not unequivocally clear whether one should classify him as or early , it is reasonable to regard him as a smith who does not descend later than the early period." His signatures appear in two principal formats — a relatively small, long inscription reading " no Kageyasu" and a bold two-character signature — with the long-signature group exhibiting "a more archaic air" and "somewhat more immature" characters. Whether these differences reflect distinct production periods or separate individuals "is a matter requiring further study," and the existence of multiple smiths using the name has been proposed on the basis of both inscription style and workmanship.
Kageyasu's forging is characteristically (板目肌) mixed with (杢目) and often a tendency toward (流れ肌), with (地沸) adhering well, (地景) entering, and prominent — typically or, in certain works, or a partial -like appearance that the has described as "an unfinished stage" conveying "an archaic, unsophisticated charm." His (刃文) is distinctive: within an overall (直刃)-based tendency, angular elements of a (互の目)-like character are intermixed, together with (丁子) and ; between widely spaced and , one sees and — "features that make his style readily identifiable." The (匂口) is characteristically deep and bright, with (小沸) adhering well, and frequent (足) and (葉) enlivening the temper, while (金筋) and (砂流し) appear throughout. The typically tends toward with , though examples showing with also occur.
Kageyasu's works consistently embody the elegance and dignity of the tradition. The has praised individual blades as displaying "a dignified " (姿), with high , pronounced , and conveying the refined archaic form of the period. His manner of workmanship is described as one that "was later carried forward into Ko-," positioning him at a pivotal juncture in the development of swordmaking. Blades retaining are especially prized as documentary material, and several note that such works are "all the more valuable" for the study of his lineage and affiliation. A by Kageyasu — "likely limited to this single example" — and a long-signature whose preservation of both and is described as "extremely good" and whose "workmanship is particularly outstanding" further attest to his significance. His oeuvre, while "comparatively many" works survive, remains a subject of ongoing scholarly inquiry, with his blades consistently recognized as possessing "an antique charm" and "a strong sense of archaic elegance."