Sikhism was founded by Guru Nanak Dev, who was born in 1469 to a Hindu family. After four epic journeys (north to Tibet, south to Sri Lanka, east to Bengal and west to Mecca and Baghdad), Guru Nanak preached to Hindus, Muslims and others, and in the process attracted a following of Sikhs (disciples). Religion, he taught, was a way to unite people, but in practice he found that it set men against one another. He particularly regretted the antagonism between Hindus and Muslims. Guru Nanak's most famous saying is, "There is no Hindu, there is no Muslim, so whose path shall I follow? I shall follow the path of God."

Guru Nanak 15th Century

Guru nanak followers were called nanakpanthi which included hindu and muslims in undivided punjab.It was guru gobind singh which laid down the sikhism as a religion .

By Guru Nanak in the 15th Century

Guru nanak,,,

Sikhism started in the year 1469 ( 5 Centuries ago ) with the birth of Guru Nanak . Guru Gobind Singh Ji established Khalsa Panth on 13 April 1699 and instructed every Sikh to use the words Singh ( for men ) and Kaur (for Women) along with their name. Sikhs prior to that don't use the words "Singh and Kaur" with their name.
Sikhism started with the birth of Guru Nanak Dev ji, and its teachings and opinions were quite different from Hinduism

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Guru nanak dev ji in fifteen century

Sikhism was founded by Guru Gobind singh ji on April 13, 1699