I have learned that I'm a descendant of Rabbi Jechiel of Porto, born about 1455. He had sons: Eliezer ULMO and Abraham, who became GUENZBURG after the family migrated to Bavaria. They seem to be the ancestors of my BISSINGER family of Ichenhausen.
Anyone with detailed information about the Portuguese period of this family or the Jews of Porto before and during the expulsion should please contact me.
