[One of t]The first mention of the Musinn (Muson, Mosenn, etc) strain occurs in W.S. Rzewuski’s book, “Sur les chevaux orientaux et provenants [sic] des races orientales”. The manuscript at the Polish National Library in Warsaw was published in 2003 with the title “Impressions d’Orient et d’Arabie”: Le fameux el-Mesenneh el-Wehabi, acheté à Abd el-Aziz, prince des Wehabis… vient de mourir à Kuzmindans mon haras. Il m’a laissé six poulains et trois pouliches avec mes juments du désert, et a sailli en1822 mes quatorze juments Nejdiehs Kocheilans, qui sont toutes pleines. In English: “The famous el-Mesenneh el-Wehabi, purchased from Abd el-Aziz, prince of the Wehabis… has just died at Kuzmin in my stud farm. He left me six colts and three fillies with my desert mares, and in1822 he covered my fourteen Nejdiehs Kocheilans mares, all of which are now in foal. Abd al-Aziz (1720–1803) was the second ruler of the House of Saud, and the son of its founder. The House of Saud was famously associated with the strain of Kuhaylan al-Musinn, or Musannan for a long time, which gives credence to Rzewuski’s account. Rzewuski went horse-shopping in Arabia between 1817 and 1819, which provides the earliest dating for…