[4] After mastering Talmudic studies at a young age, Yitzhak went on to attend the Sorbonne and then later the University of London, where he received his doctorate.

His thesis (where he coined the term Hebrew Porphyrology[5]), which made him famous in the Jewish world, concerned his claim of re-discovering Tekhelet, the type of blue dye once used for the making of Tzitzit.

During the Arab Revolt, he called, together with other rabbis, for adherence to the Havlagah policy of the Haganah and for avoidance of acts of revenge.

His son Yaakov Herzog served as Israel's ambassador to Canada and later as Director General of the Prime Minister's Office.

Some 40 years later, on 10 November 1975 Chaim Herzog repeated his father's gesture with the UN resolution that Zionism is equal to racism.

[15] Herzog was recognised as a great rabbinical authority, and he wrote many books and articles dealing with halachic problems surrounding the Torah and the State of Israel.