Per baptism records gathered in England and on Ancestry.com, an Isaac Briant was baptised 1640-03-29 in England(Somerset)Shepton Mallet, he was the son of Thomas and Joane Briant. 
Per baptism records gathered in Netherland and on Ancestry.com, an Isaac Briant was baptised 1640-12-27 in Utrecht, he was the son of Jacques Briant and Susanne Gerard. 
Per baptism records gathered in Netherland and on Ancestry.com, an Isaac Briant was baptised 1646-02-04 in Amsterdam, he was the son of Perr Brant and Cristina Jacobss. 
Any, or none, of the above could be the ancestor Isaac Bryant.

Historical
1644-1674: Mauritania - The Mauritanian Thirty-Year War
1644: China - The Manchu conquer China ending the Ming Dynasty, the subsequent Qing Dynasty rules until 1912
1644: Italy - Giovanni Battista Pamphili is elected Pope Innocent X at the Papal conclave of 1644
1645-1669: Turkey, Italy - Ottoman war with Venice, the Ottomans Invade Crete and capture Canea
1645: Japan - The death of Miyamoto Musashi, legendary Japanese Samurai warrior of natural causes
1647-1652: Spain - The Great Plague of Seville
1647: Turkey - Seven-year-old Mehmed IV becomes Ottoman sultan
1648-1653: France - Fronde civil war in France
1648-1667: Poland, Lithuania - The Deluge wars leave Polish-Lithuanian Commonwealth in ruins
1648-1669: Turkey, Italy - The Ottomans capture Crete from the Venetians after the Siege of Candia
1648: Spain, Italy - The Peace of Westphalia ends the Thirty Years War and the Eighty Years War and marks the ends of Spain and the Holy Roman Empire as major European powers
1649-1653: Ireland - The Cromwellian conquest of Ireland
1650: United States - An estimated 40,000 people are living in the American Colonies
1652: England, Netherlands - Anglo-Dutch Wars begin
1652: South Africa - Cape Town founded by the Dutch East India Company in South Africa
1654-1661: Turkey, Albania - Mehmed Koprulu is Grand Vizier
1655-1661: Sweden - The Northern Wars cement the rise of Sweden as a Great Power
1658: India - After his father Shah Jahan completes the Taj Mahal, his son Aurangzeb deposes him as ruler of the Mughal Empire
1660: England - Royal Society of London for the Improvement of Natural Knowledge founded
1660: England - The Commonwealth of England ends and the monarchy is brought back during the English Restoration
1661: China - The reign of the Kangxi Emperor of China begins
1661: India - Mehmed Koprulu dies and is succeeded by his son Ahmed
1662: France - Jacques Aymar-Vernay, who later reintroduced Dowsing into popular use in Europe, is born
1663: France - France takes full political and military control over Its colonial possessions in New France, microscope of Hooke discovers cells
1663: Turkey, Austria-Hungary - Ottoman war against Habsburg Hungary