The Ramban is the Rabbi, Rabbi Moshe bar Nachman Girondi [(and in Shomer HaDat it says from the city of Meron in Spain)] the Spaniard, a crown of splendor, the holy one, who flourished in the year 4954 [(Tzeda)] and he was a distinguished sage and authored many works, including the commentary on the Torah and on several tractates, and Sefer Torat HaAdam, and Sefer HaZikuy, and Shulchan Arba, and Sefer HaBitachon on Kabbalah...

And in addition to his learning in the wisdom of Kabbalah, his profession was that of a proven physician and philosopher. He almost did not love this wisdom, until an old sage came to him who was great in Kabbalah, and seeing that the Ramban was so much a lover of learning and a great sage, he endeavored to teach him Kabbalah, but the Ramban did not incline his ear to it. And it was the day that this sage the...

Rabbi David the Nagid, grandson of the Rambam, was in the generation of the Ramban. He was a great sage and pious man, and he would pray in the cave of the burial place of Hillel and Shammai, and water came out, and then the locusts in Ashkenaz dried up. And on the day of his death, 400 locusts died in the land of Egypt, and after two months their wives and children were uprooted from the world. And this Rabbi David had two sons...

In this year (which is the year 4954) there was a dry summer and there was no rain for almost an entire year, and all grass withered and the rivers dried up [(Tzeda LeDerekh, chapter 2)]: