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In page Lan Na:

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After Tilokkarat, Lan Na was then subjected to old-style princely struggles that prevented the kingdom from defending itself against powerful growing neighbors. The Shans then broke themselves free of Lan Na control that Tilokkarat had established. The last strong ruler was Paya Kaew who was the great-grandson of Tilokkarat. In 1507, Kaew invaded Ayutthaya but was repelled — only to be invaded in turn in 1513 by Ramathibodi II and Lampang was sacked. In 1523, a dynastic struggle occurred in Kengtung State. One faction sought Lan Na support while another faction went for Hsipaw. Kaew then sent Lan Na armies to re-exert control there but was readily defeated by Hsipaw armies. The loss was so tremendous that Lan Na never regained such dominance.[citation needed]