We have accurate details of van Roomen's travels from Würzburg to Zamosc preserved in the diary of the Polish mathematician Jan Brozek (1585-1652), also known as Ioannes Broscius or Johannes Broscius, who worked at Krakow Academy (now the Jagiellonian University). He noted the days that van Roomen spent in Krakow in his travels between Würzburg and Zamosc. Van Roomen arrived in Krakow on 24 August 1611 after spending about a year in Zamosc. He spent time studying in Krakow University library before returning on 1 September to Würzburg. Two months later he was back in Krakow, travelling on to Zamosc on 29 October. After teaching for ten months at the Zamoyski Academy in Zamosc, he stayed in Krakow from 12 to 18 August 1612 on his way back to Würzburg. It is clear that by this time van Roomen was sufficiently concerned about his health that, in 1613, he travelled to Leuven where he made a will. After returning to Würzburg in April 1613, he added a codicil detailing his wishes about his property in Würzburg. Some of his possessions were left to Prince Bishop Julius Echter while his property was left to his sister Maria van den Brouck. Returning to Leuven later in the same month, he visited a Spa in an attempt to improve his health.Although van Roomen had no children with his wife Anna, nevertheless he had two sons Jacob and Koenraad with Catharina Trauthmann. Jacob became a medical doctor in Leuven and died there in 1635 while Koenraad was born in Nuremberg and became an apothecary in Leuven, dying there in 1668. Van Roomen died in Mainz while on a journey from Leuven to Würzburg. He was travelling with his son Jacob and died in Jacob's arms.Van Roomen also wrote a commentary on al-Khwarizmi's Algebra but the only two known copies were destroyed in 1914 and 1944 (as a result of World War I and World War II). However, before they were destroyed, copies of large parts of this work were made and these copies have survived. Here is a short extract from [5] where Paul Bockstaele gives a full and fascinating account of this work by van Roomen:-