Sadashkana or Sadaṣkaṇa was, according to the Rabatak inscription

Rabatak inscription

The Rabatak inscription is an inscription written on a rock in the Bactrian language and the Greek script, which was found in 1993 at the site of Rabatak, near Surkh Kotal in Afghanistan...

, the son of the Kushan emperor Kujula Kadphises

Kujula Kadphises

Kujula Kadphises, reigned was a Kushan prince who united the Yuezhi confederation during the 1st century CE, and became the first Kushan emperor...

. In the inscription, he is not given the title of king, suggesting that he did not rule directly, but that, instead, his own son Vima Kadphises

Vima Kadphises

Vima Kadphises was a Kushan emperor from around 90–100 CE. As detailed by the Rabatak inscription, he was the son of Vima Takto and the father of Kanishka.-Rule:...

ruled after the death of Kujula Kadphises.

Another inscription, the gold plate inscription of Senavarman, also mentions Sadashkana as the Devaputra (son of god), son of maharaja rayatiraya Kujula Kataphsa (Kujula Kadphises):

"Maharaja rayatiraya Kuyula Kataphsaputra Sadashkano devaputra"

"The son of god Sadashkano, son of the Great king and king of kings, Kujula Kaphises"