Today it is the Shaheedi Diwas (Martyrdom day) of the Fifth Guru, Guru Arjan Dev jee. Guru Sahib not only sowed the seeds of martyrdom and demonstrated fearlessness acquired in the love of God, but also illustrated acceptance of God's Will (Hukam) that is the foundation of Sikhi. Dhan Guru Arjan Dev Ji and thousands of salutations to the countless martyrs in Sikh history.
Below is a video of Bhai Joginder Singh talking about the the martyrdom of the Guru Arjan Dev jee relating to spirituality:
Portuguese Pope's account of the martyrdom of Guru Arjan Dev jee:
> Shahaadat Guru Arjan Dev Ji (Kathaa) - Bhai Pinderpal Singh
> Master of Martyrs - Shaheedaa De Sirtaaj
> Small Accident with Frying Pan