%%Trần Nguyên Đán (1325-1390) or General Băng Hồ - a high-ranking mandarin of the Nhà Trần(Trần Dynasty) - was the greatgrandchild of Trần Quang Khải and the maternal grandfather of Nguyễn Trãi. He entered the mandaridom when Hồ Quý Ly was abusing the power of Nhà Trần (Trần Dynasty). Later, he asked for retirement and led a secluded life in Côn Sơn (Hải Dương). His work was Băng Hồ Ngọc Hạc Tập (mislaid).