Herberstein, ambassador of the Holy Roman Emperor in Russia, used both Russia and Moscovia in his work on the Russian tsardom and noted: "The majority believes that Russia is a changed name of Roxolania. Muscovites ("Russians" in the German version) refute this, saying that their country was originally called Russia (Rosseia)". Pointing to the difference between Latin and Russian names, French captain Jacques Margeret, who served in Russia and left a detailed description of L’Empire de Russie of the early 17th century that was presented to King Henry IV, stated that foreigners make "a mistake when they call them Muscovites and not Russians. When they are asked what nation they are, they respond 'Russac', which means 'Russians', and when they are asked what place they are from, the answer is Moscow, Vologda, Ryasan and other cities". The closest analogue of the Latin term Moscovia in Russia was “Tsardom of Moscow”, or “Moscow Tsardom” (), which was used along with the name "Russia", sometimes in one sentence, as in the name of the 17th century Russian work On the Great and Glorious Russian Moscow State (). Official state names From Rus' to Ruthenia Southwest principalities In the 13th–14th centuries, many of southwestern Rus' principalities were united under the power of the Kingdom of Rus' (), historiographically better known as the Kingdom of Galicia–Volhynia. Roman the Great was variously named dux Rutenorum, princeps Ruthenorum or rex Ruthenorum by Polish chroniclers. Danylo of Galicia was crowned Rex Ruthenorum or "king of the Rus'" in 1253. Alternatively, Danylo and his brother Vasylko Romanovych were styled Princeps Galiciae, Rex Russiae, and Rex Lodomeriae in Papal documents, while the population of Halych and Volhynia was called Rusciae christiani and populus Russiae amongst other names. The Gesta Hungarorum ( 1280) stated that the Carpathian mountains between Hungary and Halych were situated in finibus Ruthenie ("on the borders of Ruthenia"). Galicia–Volhynia declined by mid-14th century due to the Galicia–Volhynia Wars after the poisoning of king Yuri II Boleslav by local Ruthenian nobles in 1340. Iohannes Victiensis Liber (page 218) records the death of Boleslav as Hoc anno rex Ruthenorum moritur (...) ("In that year the king of the Ruthenians died (...)"). The Grand Duchy of Lithuania, Rus', Samogitia became its successor state, and the Kingdom of Poland later absorbed Galicia as the Rus Voivodeship. The latter became the Ruthenian Voivodeship (or "Russian"; ) in 1434. While in the