While he upheld Kushan rule in northern India, it is likely that Kanishka II lost the western part of his empire, namely
Bactria/
Tokharistan to the Sasanian
Shapur I (240-272 CE), whose conquests would be consolidated by the
Kushano-Sassanians. In his inscriptions at
Naqsh-e Rostam Shapur now claimed that he controlled the realm of the Kushans (Kūšān šahr) "up to Pašakibur (i.e. Purushapura)" (
Peshawar), suggesting that he may have expanding even beyond the
Hindu-Kush at the expense of the Kushans. The rock inscription at
Rag-i-Bibi further support this view. Several overstrikes by the
Kushano-Sasanian Peroz I Kushanshah over coins of Kanishka II are known, and it is from the time of Peroz that the first
Kushano-Sasanian coins were issued south of the
Hindu-Kush. Kanishka II recovered control of
Gandhara at one point, as well as
Kapiśa, and there are suggestions that following these successes he may have created a second Era of Kanishka in celebration of the hundredth anniversary of the original one. ==Coinage and dated statuary==