ר' יצחק בן דורבלו

Rabbi Yitzchak ben Dorbolo, Isaac ben Dorbolo, ר’ יצחק בן דורבלו, was a rishon of Ashkenaz and France who lived around 1150. He was a great traveler, and from his own journeys he knew France and Germany, Bohemia and Moravia, Poland and Russia. At some point after 1140 he paid a visit to Rabbeinu Tam at Ramerupt.

He stayed for a time in Worms, and there, he reports, he saw a teshuvah sent by the sages of Eretz Yisrael in answer to a question that the rabbis of the Rhineland had addressed to them in 960, in the days of Emperor Otto I, about a report that Mashiach had appeared. That teshuvah is mentioned elsewhere as well, though some question whether it is genuine.

He is known chiefly through his additions to the Machzor Vitry. Charles Taylor once took him for the compiler of the Machzor, but he was not; his additions are marked either by his full name or by a plain letter tav, standing for tosefet, and they appear in the British Library manuscript 27,200–27,201, on which all modern editions of the Machzor rest. He often signs his additions, and in one place he states outright that the explanations up to that point were added by him, Yitzchak ben Dorbolo, while what follows is from the Machzor of Rabbi Simchah of Vitry himself.

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