Marsiya is an elegiac poem written (especially in Persia and India

India

India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

) to commemorate the martyrdom and valour of Hussain and his comrades of the Karbala

Karbala

Karbala is a city in Iraq, located about southwest of Baghdad. Karbala is the capital of Karbala Governorate, and has an estimated population of 572,300 people ....

. They are essentially religious.
The word ‘Marsiya’ is derived from the Arabic word ‘Risa’, meaning a great tragedy or lamentation for a departed soul.

Marsiya (or elegy

Elegy

In literature, an elegy is a mournful, melancholic or plaintive poem, especially a funeral song or a lament for the dead.-History:The Greek term elegeia originally referred to any verse written in elegiac couplets and covering a wide range of subject matter, including epitaphs for tombs...

), is nearly always on the death of Hasan

Hasan ibn Ali

Al-Hasan ibn ‘Alī ibn Abī Tālib ‎ is an important figure in Islam, the son of Fatimah the daughter of the Islamic prophet Muhammad, and of the fourth Caliph Ali ibn Abi Talib. Hasan is a member of the Ahl al-Bayt and Ahl al-Kisa...

 and Hussein and their families, but occasionally on the death of relatives and friends.