Cracow, 1653: The famous R’ Isaac R’ Yeckeles passed away in Cracow.
R’ Isaac, is known as the one who built the beautiful Baroque style R’ Isaac R’ Yeckeles Shul still erect in Cracow. For the job, he commissioned the Swiss architect, Giovanni Battista Trevano. He died in the year of its completion.
In Cracow, it was known that the cement was mixed with egg yolks instead of water. This was done so, to improve the strength of the building, which has, by the way, nearly five feet thick walls.
The Shul was completed in 1644.
Sources: See here
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