Chronology of events:

For some events, the year is certain but the month and day are not. Example: We know only the year for the collections of Leeuwenhoek's letters published in Dutch during his lifetime.

For other events, the season or month are certain but the day is not. Example: Leeuwenhoek mentions that someone visited him "last month".

On the other hand, many events did indeed happen on the first day of a month. Example: public appointments to Delft's city offices took effect on January 1 of each year. Thus:

  • A date of January 1 in a given year may indicate that the year is certain but the month and day are not.
  • A date of 1 in a given month may indicate that the year and month are certain but the day is not.

Unless otherwise indicated, for events in England, the date given is Old Style, 10 days behind the Dutch Republic's New Style until 1700 and then 11 days behind.

Date
February 21, 1730 cousin Adriaen Lambrechts Leeuwenhoek, the notary, had his license suspended by the Heren van de Weth
August 7, 1732 Maria van Leeuwenhoek added codicil to 1721 will
September 23, 1733 Maria van Leeuwenhoek assessed for property tax on the Gulden Hoofd
November 14, 1739 Maria van Leeuwenhoek funded the Oude Kerk memorial for her father
June 24, 1741 Maria van Leeuwenhoek made a will charging the Kamer van Charitate with cleaning and maintaining the Oude Kerk memorial
May 20, 1744 Maria van Leeuwenhoek made her final will
April 25, 1745 Maria Thonis van Leeuwenhoek died
April 30, 1745 Maria Thonis van Leeuwenhoek buried
May 1, 1745 The Leeuwenhoek wills opened by notary Joris Geesteranus in the presence of the heirs
June 26, 1745 Maria van Leeuwenhoek's estate inventoried
August 23, 1745 house on Hippolytusbuurt, het Gulden Hoofd, offered for sale
August 25, 1745 house on Hippolytusbuurt, het Gulden Hoofd, sold to great-nephew Dirk Haaxman
September 25, 1745 Maria van Leeuwenhoek's 1744 will presented to Weeskamer
March 22, 1746 Maria van Leeuwenhoek's heirs agree that the two estates should be considered jointly and divided evenly
September 15, 1746 Maria's van Leeuwenhoek's estate partly distributed to her heirs
March 6, 1747 Auction of Leeuwenhoek's microscopes announced in Leydse Courant
May 22, 1747 Auction of Leeuwenhoek's microcopes announced in cities throughout Europe
May 23, 1747 Andries Voorstad auctioned the books and instruments of a "Liefhebber"
May 29, 1747 Leeuwenhoek's magnifying glasses auctioned
September 26, 1748 Margareta Cornelia Hobus died childless
August 19, 1749 Executors of daughter Maria's estate advertised for heirs
August 14, 1755 niece Margareta Cornelia Hobus's estate
December 1, 1755 Josina van der Sprenkel sold the house on the Oosteinde that daughter Maria had bequeathed her
October 28, 1757 Executors of daughter Maria's estate declared that it cannot be distributed
October 17, 1763 niece Maria's granddaughter Maria Jans Haaxman divorced from Steven Bolland
December 14, 1765 great-nephew Dirk Haaxman sold the Gulden Hoofd
September 23, 1776 daughter Maria, final accounting of her estate

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