>>67692022O-okay how about this: The contemporary PRC is the legitimate successor to the millennia of Chinese dynasties even though the KMT who they took the title from is still kicking around in Taiwan because in 1991 they retired the remaining previously elected representatives for mainland territories who had held claim since 1948, effectively renouncing their legislative and by extension governmental sovereignty over the mainland
Arguably the PRC also holds the legacy of the Mongol Empire if we consider the Yuan dynasty and its successors to be legitimate inheritors of the title though like every outside force to conquer China they kinda just became part of China
Real shit answer though is that all that shit died forever with Pu Yi in 1967 and hasn't meaningfully mattered since at most 1912 when the ROC was declared, and also countries that still have monarchies are all cucks