Zacharias Jansen

Zacharias Janssen
Zacharias Janssen
Born	1585 (1580) The Hague
Died	given as before 1632 (sometimes 1638) Amsterdam
Nationality	Dutch
Other names	Zacharias Jansen, Sacharias Jansen
Occupation	spectacle-maker (sometimes counterfeiter)
Known for	possible inventor of the Microscope and the Telescope (posthumous claim)

Zacharias Janssen (also Zacharias Jansen or Sacharias Jansen) (1585 – pre-1632) was a Dutch spectacle-maker from Middelburg associated with the invention of the first optical telescope. Janssen is sometimes also credited for inventing the first truly compound microscope. However, the origin of the microscope, just like the origin of the telescope, is a matter of debate.

Zacharias Janssen was born in The Hague. Local records seem to indicate he was born in 1585 although a date of birth as early as 1580 or as late a 1588 are also given. His parents were Hans Martens (who may have had the occupation of a peddler) and Maeyken Meertens, both probably from Antwerp, Belgium. He grew up with his sister Sara in Middelburg, at the time the second most important city of the Netherlands. He was known as a "street seller" who was constantly in trouble with the local authorities.

He himself stated he was born in The Hague on the marriage file of his first marriage, with Catharina de Haene, on October 23, 1610. When this file was refound by Cornelis de Waard in 1906, De Waard found the following excerpt: Sacharias Jansen, j.g. uut Den Haag, "Zacharias Jansen, bachelor from The Hague" Before, it was often thought that Janssen was a native of Middelburg. In 1612, Zacharias and Catharina had a son they named Johannes Zachariassen.

In 1615 Zacharias was appointed guardian of two children of Lowys Lowyssen "geseyt Henricxen brilmakers" (called Henry the spectacle maker). It is surmised that Zacharias also took possession of Lowys Lowyssen's spectacle-making tools because the first record of Zacharias Janssen being a spectacle maker appears in 1616. The family had to move to Arnemuiden in 1618 after Zacharias's counterfeiting activities were exposed. There Zacharias was again accused of counterfeiting in 1619 causing him to be on the move again, ending up back in Middleburg in 1621.

A year after the death of Janssen's first wife in 1624, he married Anna Couget from Antwerp, who was the widow of a Willem Jansen (probably a relative of Janssen). He moved to Amsterdam in November 1626 with a profession of a spectacle maker, but was bankrupt by 1628. Janssen has been given a death date as late as 1638 although his sister said he was dead in 1632 testimony and his son Johannes declared his parents had died by the time of his marriage in April 1632.

Over the years there have been claims Zacharias Janssen invented the telescope and/or the microscope in Middelburg between 1590 and 1618. Zacharias worked for some period of his life as spectacle-maker (a very competitive and secretive trade) and at one time lived next door to Middelburg spectacle maker Hans Lippershey, also claimed to have invented the telescope. Janssen's attribution to these discoveries is debatable since there is no concrete evidence as to the actual inventor, and there are a whole series of confusing and conflicting claims from the testimony of his son and fellow countrymen, in different testimony in 1634 and 1655.

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Wikipedia