Boechari tried to reconstruct the early stage of Sailendra based on Sojomerto inscription, while other historians such as Slamet Muljana and Poerbatjaraka tried to reconstruct the list of Sailendran king in middle and later period with their connections to Sanjaya and Srivijaya, based on inscriptions and Carita Parahyangan manuscript.
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This theory is based on Carita Parahyangan that tells of the ailing King Sanjaya ordering his son, Rakai Panaraban or Panangkaran, to convert to Buddhism, because their Shivaistic faith was feared by the people, in favour to the more pacifist Buddhist faith.
In Javanese the term is said to derive either from "Sailendra", the name of the ruling family in the eighth and ninth centuries when Borobudur was built, or from its earlier being given by the god Sang Hyang Hendra.