1991 Book, The Arabian Horse Families of Poland 1790-1987 By Britta Fahlgren (Stallion Table 5/1; Mare Table 28/1) Beko III was a mare bred by Weil (Stud - Germany) Sire: Amurath O A Dam: Safra II 1838 She was the dam at Weil of Bournu 1849 s gr (By Amurath 1829)
Reference:
Al Khamsa Note: Siglavi (BAB) 1810 s gr is listed as sire of Sady III 1821 Siglavi also called Schwarzenberg