Here is your short paragraph on Shivaji Jayanti:
Bal Gangadhar Tilak, the great national hero and leader was chiefly responsible for rescuing the samadhi (resting place) of Maratha ruler Shivaji (1630-1680), in Fort Raigarh (Colaba district).
Shivaji was a disciple of Guru Ram Das and bravely fought, against the Mughal king Aurangzeb. He united the Marathas into a powerful race and established a Hindu kingdom.
Tilak revived his memory so as to give an inspiration to the freedom fighters who were fighting for the country’s liberty. May 7 is celebrated every year as Shivaji Jayanti with great zeal in the state of Maharashtra and is declared a holiday in the state.