This is the story of the martyrdom of Guru Arjan, the fifth Sikh Guru and the first Sikh martyr. Guru Arjan was executed by the Mughal Emperor Jahangir in 1606 for refusing to convert to Islam. He was tortured and eventually martyred for his refusal
From Wikipedia
Guru Arjan was the fifth of the ten Sikh Gurus. He compiled the first official edition of the Sikh scripture called the Adi Granth, which later expanded into the Guru Granth Sahib. He is regarded as the first of the two Gurus martyred in the Sikh faith. He is credited for founding the settlements of Kartarpur, Hargobindpur, and Tarn Taran.