Historical Sulu

Sinug in the Language Tree

"The principal branches of the Malayo-Polynesian Language Family. Orange is Outer Western Malayo-Polynesian, dark red is Inner Western Malayo-Polynesian, green is Central Malayo-Polynesian, purple is South Halmahera–West New Guinea languages, and pink is Oceanic. (Some areas with oceanic languages are not visible on this map.)"

Sulu in Ming Court

Paolo Santangelo (2013). Zibuyu, “What The Master Would Not Discuss”, according to Yuan Mei (1716 - 1798): A Collection of Supernatural Stories (2 vols). BRILL.

Arabic and Persian Loanwords in Tagalog Lexicon

Jean-Paul G. POTET (2013). Arabic and Persian Loanwords in Tagalog. Lulu.com.
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Sulu and Champa Empire

Philippine history Teodoro Agoncillo claims that Buranuns, the natives of Sulu, have had historical experience with the Orang Dampuan or the "People of Champa"[1]

In another book, it is claimed that the Orang Dampuans were vassals of the Sri Vijaya Empire who established trading colony with the Buranuns of Sulu, eventually settled in Taguima (now Basilan) and become the Yakan ancestors. [2]

"Later, after the island had come under the dominion of Sri-Vishaya, Champa ships came again to Sulu. That they continued to trade there is substantiated by the claim in an early Sulu manuscript that in the century before the arrival of the Spaniards from four hundred to five hundred junks arrived annually from Cambodia, Champa and China, with which Sulu principally traded. At that time the island is said to have been very densely populated and to have been one of the great trade centers of the Archipelago." [3]
References:
[1] https://books.google.com.ph/books?id=SIq_FvJUr40C&pg=RA3-PA18-IA1&lpg=RA3-PA18-IA1&dq=Sulu+Champa&source=bl&ots=QFxHPQD_l1&sig=OVFU3M2C8lG-e2mqeZkLFq1CLBY&hl=en&sa=X&ved=0CDkQ6AEwBmoVChMIqeanounVxwIVQRqOCh3_egrQ#v=onepage&q=Sulu%20Champa&f=false

[2] https://books.google.com.ph/books?id=gUt5v8ET4QYC&pg=PA46&lpg=PA46&dq=Sulu+Champa&source=bl&ots=gw3cMHV3-z&sig=Fz3MCzlSyjDcaxlF01H9vwh4d04&hl=en&sa=X&ved=0CDEQ6AEwA2oVChMIqeanounVxwIVQRqOCh3_egrQ#v=onepage&q=Sulu%20Champa&f=false

[3] http://www.globalsecurity.org/military/world/philippines/history-sulu-sultanate.htm

Sulu and the Empire of Brunei

The Sultanate of Brunei ruled during the 14th to the 16th century. Its territory allegedly covered the northern part of Borneo and the southern Philippines. What was its relationship with Sulu?

Sulu and the Chinese Yuan Dynasty

James Warren mentioned in his book that the Sulu's interaction with China maybe as early as the Yuan Dynasty (1271–1368).