Lobsang Chökyi Gyaltsen, 4th Panchen Lama
Losang Chö kyi Gyaltsen (Tibetan: བློ་བཟང་ཆོས་ཀྱི་རྒྱལ་མཚན་, Wylie: blo bzang chos kyi rgyal mtshan) (1570–1662) was the fourth Panchen Lama of the Gelug school of Tibetan Buddhism and the first to be accorded this title during his lifetime.
Losang Chö kyi Gyaltsen was the teacher and close ally of the 5th Dalai Lama, called "the Great". The "Great Fifth" gave him Tashilhunpo Monastery as a living place and declared him to be an incarnation of Amitābha, and since then, every Panchen Lama has been the master of Tashilhunpo.
When Losang Chö kyi Gyaltsen died in 1662, aged 91 or 92, the Fifth Dalai Lama began the tradition of recognising his reincarnation. He composed a special prayer asking his master to return and ordered the monks of the great monasteries to recite it. He also reserved the title of Panchen (short for Pandita chen po or 'Great Scholar'), which had previously been a courtesy title for all learned lamas, exclusively for him, and this title has continued to be given to his successors and, posthumously, to his predecessors starting with Khedrup Gelek Pelzang, 1st Panchen Lama.
The 4th Panchen Lama was a prolific writer and teacher, composing more than three hundred works.