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Jayadewa or Jayadeva (Sanskrit: जयदेव, Baybayin: ; full title: Hwan Nāyaka tuhan Pailah Jayadewa) was the name of the Lord Minister of Pailah at the time that the Indianized-Sanskritized Laguna Copperplate Inscription (LCI) was written in c. 900 CE. According to the document, he served as the representative of the "Commander in Chief" (pamegat senāpati di Tundun) in pardoning the descendants of an individual named Namwaran of his debts. Although no other records describe his life and works, Jayadewa is an important figure in Philippine historiography because he is one of the persons clearly identified in the LCI, which is the earliest known written document found in the Philippines.
|Hwan Nāyaka tuhan Pailah|
|Reign||c. 900 CE|
He married Dayang Bukah, as in exchange to clear the debit of 1 kati and 8 suwarnas of Bukah's parents which is Namwaran and Dayang Angkatan.
|“||Sa pagkakátaóng itó, si Dayang Angkatán sampû ng kaniyáng kapatíd na nagngangalang Buká (bulaklák), na mga anák ng Kagalang-galang na si Namwarán, ay ginawaran ng isáng kasulatán ng lubós na kapatawarán mulâ sa Punong Pángkalahatán sa Tundún (Tondo) sa pagkatawán ng Punong Kagawad ng Pailáh na si Jayadewa.||”|
"On this occasion, Lady Angkatan, and her brother, Buka, the children of the Honourable Namwaran, were awarded a complete pardon from the Overall Leader [King] of Tundún, represented by the Lord Minister of Pailáh, Jayadewa."
- Morrow, Paul (2006-07-14). "The Laguna Copperplate Inscription". Archived from the original on 2008-02-05. Retrieved 2008-02-05.