1699 followed by 1700
1699 (MDCXCIX) was a common year starting on Thursday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1699th year of the Common Era (CE) and Anno Domini (AD) designations, the 699th  year of the 2nd millennium, the 99th  year of the 17th century, and the  10th  and last year of the 1690s decade. As of the start of 1699, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.April–June
April 13 – The 10th Sikh guru, Guru Gobind Singh, creates the Khalsa at Anandpur Sahib.
May 1 – Pierre Le Moyne d'Iberville founds the first European settlement in the Mississippi River Valley, at Fort Maurepas (Ocean Springs, Mississippi).
May 10 – Billingsgate Fish Market in London is sanctioned as a permanent institution by an Act of Parliament, with the provision "that after the tenth of May, 1699, Billingsgate Market should be, every day in the week except Sunday, a free and open market for all sorts of fish, and that it should be lawful for any person to buy or sell any sort of fish without disturbance."
June 11 – England, France and the Dutch Republic agree on the terms of the Treaty of London (1700) (Second Partition Treaty) for Spain.
June 14 – Thomas Savery demonstrates his first steam pump to the Royal Society of London.