Revalenta Arabica, or Ervalenta, was a preparation sold in the 18th century as an empirical diet for patients. It was sold as a cure-all, supposedly effective at treating diseases of the blood, brain, kidney, liver, lungs, nerves, glands, mucous membranes, and stomach.
The product that was mass-marketed was, in reality, only a preparation of the common lentil, its first name being formed for disguise by the transposition of its earlier botanical name, Ervum lens. While lentils are a healthy and nutritious food, Revalenta Arabica's value was about similar to the common pea-meal (or ground split peas).
Original The real Revalenta arabica is the "root" of Glossostemon bruguieri. The roots were sold under the name Arabgossi.Adolf Engler, Carl Prantl: Die Natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten insbesondere den Nutzpflanzen. W. Engelmann, Leipzig 1887. Nachträge zu III. 6. S. 241 In Egypt, they are known as Moghat. The original plant of the product was unknown for a long time, until the German explorer of Africa and botanist Georg Schweinfurth discovered Glossostemon bruguieri as its source.p. 35 of Max Meyerhof: Alî at-Tabarî's "Paradise of Wisdom", one of the oldest Arabic compendiums of medicine. In: Isis. Tome 16, Nr. 1 (July 1931), pp. 6–54.
They are prepared as a light dish for ailing or ill persons. Plant and usage had been described in Firdous al-Hikmah ("Paradise of Wisdom") of Ali al-Tabari, a medicinal encyclopedia from the 9th century AD."Paradise of Wisdom" chapter 245
References This article incorporates text from the International Cyclopedia of 1890, a publication now in the public domain.