 Complete the following phrase:  The colors of the national flag of Romania  have a long history, though the association of the three colors only dates to the 18th century. Red, yellow and blue were found on late 16th-century royal grants of Michael the Brave, as well as shields and banners. Thus, the late 13th century Wijbergen armorial shows the coat of arms of the Wallachian ruler Litovoi as consisting of a shield of ten vertically alternating gold-and-red bands, which were the colors of the coat of arms of the Second Bulgarian Empire, of which Wallachia was part. The same two colors, gules and or, also appeared on the late 15th century flag and coat of arms of Moldavia, during the reign of Stephen the Great . Then, from the late 16th century until the mid-17th century, the historical coat of arms of Transylvania gradually developed as a shield party per fess, consisting of a black eagle on blue background in the upper field, a dividing red band in the middle, and seven red towers on golden background in the lower field. Finally, in the last quarter of the 18th century, Bukovina gets its own coat of arms from the Habsburg Empire, a blue-and-red shield party per pale with a black aurochs head in the middle, and three golden six-pointed stars surrounding it. During the 