The Dalai Lama is a religious figure in Tibetan Buddhism. He is its highest spiritual teacher. A new Dalai Lama is said to be the re-born old Dalai Lama. This line goes back to 1391. The 14th and current Dalai Lama is Tenzin Gyatso
Between the 17th century and 1959, the Dalai Lama was the head of the Tibetan government. During winter, the Dalai Lama stayed in the Potala palace. In summer they were in the Norbulingka palace. These two palaces are both in Lhasa, Tibet. In 1959, the Dalai Lama had to flee from Tibet to Dharamsala, India due to Chinese persecution. This is where he still is today.
The current Dalai Lama is His Holiness Tenzin Gyatso.
"Dalai" is originally from Mongolian, meaning "ocean" and "Lama", from Tibetan, meaning "the highest principle". In 1653, during the Qing Dynasty, this title was authorized to Dalai Lama V by the Chinese Emperor for the first time.