Isaak Kann was a member of the richest and most important Jewish family during the ghetto period. He probably lived at the Kanne from 1638 to 1701. His wealth, influence and connections (including dealings with important royal families) made him one of the leading representatives of the Frankfurt Jews in his day. Kann developed great ambitions in the Judengasse and this brought him into violent conflict with another very powerful figure, Abraham Drach, resulting in a rivalry that lasted for years. This struggle split the inhabitants of the Judengasse into two hostile camps, and is known as the Drach-Kann disputes. Although Kann 1686 lost the great lawsuit against Drach that finally settled the dispute, he remained one of Frankfurt's wealthiest and most highly respected Jews.