Ruarus Joachim , (Germ. Ruar,) the brother of Martin Ruarus, became a student in the University of Altorf on the 9th of July, 1612. He had received the whole of his previous education under the paternal roof ; and his object in going to that University was to prepare himself for the medical profession, in which he afterwards attained to considerable eminence. 

During his residence at Altorf, he was converted, by his brother Martin, to the Unitarian faith, of which he remained a steady and consistent professeur through the rest of his live. He was known among the Antitrinitarian party by the name of Dominicus Anastasius Crispicus. The origin of the name Crispicus has already been explained, in the account of his brother Martin ; and he was Dominicus Anastasius from his Christian name Joachim, which, in Hebrew, signifies The rising, [or avenging] of the Lord.

In the first Volume of the Correspondance of Martin Ruarus, there are two letters addressed to this brothers, Joachim and Peter, jointly, and numbered 14 and 15. They are without date ; but an introductory note informs the reader, that they ought to have placed much earlier. In the second Volume, besides one (N° 8) written to the two brothers jointly, there are two (N° 11 and 98) adressed to Joachim, and two (N° 18 and 19) to Peter. In the former of the two addressed to Joachim, Martin earnestly entreats him to leave no stone unturned, in his endeavours to bring over their brother Peter to the same way of thinking, on religious subjects, with themselves ; and adds, “O Jucudum illum diem, et eretâ notandum, quando nuncium hoc à te acceptarus sum!” It does not appear, however, that Peter over quitted the communion of the Eavgelico-Lutheran Church.

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