The Lao People's Democratic Republic is the modern state derived from the final Kingdom of Laos. The political source of Lao history and cultural identity is the Tai kingdom of Lan Xang, which during its apogee emerged as one of the largest kingdoms in Southeast Asia. Lao history is filled with frequent conflict and warfare, but infrequent scholarly attention. The resulting dates and references are approximate, and rely on source material from court chronicles which survived both war and neglect, or outside sources from competing neighboring kingdoms in what are now China, Vietnam, Burma, Thailand, and Cambodia.