Able to trace one's descent through a long line of ancestors; of ancient lineage.
The Century Dictionary (Public Domain)
Use "long-descended" in a sentence
"The clergy at length approached, and intimated they were about to conclude the last duties, by removing the body which had been lately occupied and animated by so haughty and restless a spirit, to the dust, darkness, and silence of the vault, where the long-descended Counts of Provence awaited dissolution."
"One man, two men, — possibly, three or four, — have cast behind them the long-descended costume of the academy, and the expectations of fashion, and have said, This world is too fair, this world comes home too near to me than that I should walk"
"If he was wealthy, noble, and long-descended, I also was a noble and an opulent heiress."