What's the allusion to the phrase "Two in the Palace"?

About the allusion to "Two in the Palace"

"Two in the Palace" has "In the past, there was an old Prime Minister Pan, Mrs. Li took the place of the Queen's wife, and gave birth to the Prince in the Zizhu Forest, and his name has been known throughout the ages", and a lot of people don't know what allusion it is. In fact, this is a story from the Spring and Autumn period and the Warring States period.

In the ninth collection of the Peking Opera Selections published by the Chinese Opera Publishing House, there is a note here: "Prime Minister Pan Ge - according to legend, when King Xi of the Zhou Dynasty (one said that King Yi), his uncle Mei Lun competed for power and plotted to kill Empress Su, the Prime Minister Pan Ge took his own wife to take the place of death. Empress Su escaped unharmed and gave birth to a prince in the purple bamboo forest. Afterwards, Empress Su returned to the court and thanked Pan Ge."

Press: According to Mr. Niu Pei, Mr. Wang Yaoqing and his disciples Cheng Yucheng, Yu Yuhang, and Luo Yuping taught at the Chinese Opera School in those years, and the lyrics of "Pan Lao Chancellor" here are "Chancellor Pan Ge".

The story of Prime Minister Pan Ge is found in the Ming legend The Parrot's Tale.

The current Xiang Opera high-cavity opera also has a play called "Pan Ge Thoughts of His Wife", which is one of the twists in the full version of "The Parrot's Tale". In the Xiang Opera, Xu Shaoqing plays Pan Ge, the plot is: 13 years after Pan Ge saved Su Hou, Pan Ge's birthday, his son celebrated his birthday, which made him miss his wife, very sad. Suddenly, it is reported that Empress Su has returned and the prince she has given birth to is now 13 years old. Pan Ge had mixed feelings of sadness and joy, happy to see the reunion of husband and wife, father and son of King Xi of Zhou; but he himself was alone, with tears in his eyes.

The 19th episode of "Compilation of Traditional Sichuan Opera Scripts" also contains the play "White Parrot", which is the story of "The Parrot's Tale": when King Yi of Zhou, the White Tooth country paid tribute to the three treasures of the White Parrot, the Warm and Cool Jumper, and the Wake-Up Felt. At that time, the king's consort Su Ying was in her third trimester of pregnancy, so she was appointed as the main palace in charge of the three treasures. King Yi's other consort, Princess Mei, was jealous and planned with her brother, Mei Lun, to take advantage of the banquet with Su Ying to intentionally damage the three treasures, and falsely accuse Princess Su of misconduct, which led to King Yi's twisting of the law and Princess Su's death. The Prime Minister Pan Ge knew that Su Fei was innocent of the wrongdoing, and he took his wife Li, who looked like Su Fei, to take the place of Su Fei. He sent Princess Su to his nephew, Su Jing, to settle down. On the way, Princess Su gave birth to a prince. Mei Fei divination, know Su Fei is not dead, ordered Mei Lun to search the Pan House, but did not find. He ordered Mei Lun to search Pan's house but found nothing. He then sent his men to hunt for the Prince, but in vain. Consort Su abandoned the Prince for adoption by a peasant family. Thirteen years later, mother and son were finally reunited and wrote to Pan Ge. Pan was in mourning for his late wife and missed his wife, so he immediately sent a letter to King Yi. The king then welcomed Princess Su and her son back to the court, and passed the throne to the crown prince, imprisoning Princess Mei and beheading Mei Lun. This is a popular Sichuan Opera favorite, "Returning the Wife to the Golden Palace".