Peter Forsskål, sometimes spelled Pehr Forsskål, Peter Forskaol, Petrus Forskål or Pehr Forsskåhl was a Swedish-speaking Finnish explorer, orientalist, naturalist, and an apostle of Carl Linnaeus.
Flora Aegyptiaco-Arabica, 1775
Carsten Niebuhr, or Karsten Niebuhr, was a German mathematician, cartographer, and explorer in the service of Denmark. He is renowned for his participation in the Danish Arabia expedition (1761-1767). He was the father of the Danish-German statesman and historian Barthold Georg Niebuhr, who published an account of his father's life in 1817.
Carsten Niebuhr in the attire of a distinguished Arab in Yemen, gift from al-Mahdi Abbas, Imam of Yemen
Niebuhr inscription 1. Now known to mean "Darius the Great King, King of Kings, King of countries, son of Hystaspes, an Achaemenian, who built this Palace". Today known as DPa, from the Palace of Darius in Persepolis, above figures of the king and attendants
Niebuhr inscription 2. Now known to mean "Xerxes the Great King, King of Kings, son of Darius the King, an Achaemenian". Today known as XPe, the text of fourteen inscriptions in three languages (Old Persian, Elamite, Babylonian) from the Palace of Xerxes in Persepolis.