The monastery bears the name of a certain Lady Pluem, an older woman being visited by King Naresuan (reign 1590-1605 CE) one night, following a local legend. Van Vliet describes the event in an account from 1640 CE - "The short history of the Kings of Siam". The story goes as follows:
“One evening when His Majesty was on a perahu in the river, he was caught in a great rainstorm before he was able to return to the palace. Consequently, he went to a small house where a poor old woman lived and entered unrecognized with great commotion. The woman was very frightened and said, "My son, don't you know, that our King is often close by?" In reply His Majesty said vehemently, "Mother, and so what if he should hear it? What would it matter if he kills me. That would be my misfortune which strikes many people unexpectedly." The woman fell at his feet and pleaded dejectedly that he not speak of the king in such a way. She said, "The gods have provided us with His Majesty therefore, he never does things which are bad. He is an avenger of the gods and the implementer of their sentences against our evil. We must obey those who have been placed here to rule us ".
The more the woman tried to silence the king with such reasons, the more vehemently His Majesty bellowed. Finally, the woman asked that he leave her house because she did not want to become a party to his misdeeds. The king said that he would, but first demanded a drink of arak because he had become cold from the rain. The woman answered, "Son, you know of course that this is the fast and that as long as it lasts, no one may buy or drink arak. But if you want dry clothes such as those I am wearing, I will give them to you. I will wash and dry what you have on. In the meantime go rest and sleep a little."
The king accepted the clothes offered to him, had his clothes washed and dried, but would not desist from his wish for arak. He said that he did want to be bound by the strict laws of the king. Finally, the woman filled a tiny little jug with arak. She swore that she had bought the arak before the start of the fast and had not drunk any of it since then. She offered it to the king and made him promise that he would not report her to anyone. After he had drunk, the woman led him to her little mat to sleep while she dried his washed clothes. When the king awoke, he put on his dried clothes, thanked the woman, and said his farewells. The woman said, "Son, remain here until daylight or go home with your boat quietly so that you do not make too much noise for the king and have something evil befall you."
His Majesty answered, "I will do that," and left the old woman and her poor little house. He then returned with his little perahu to his bodyguards, who were waiting with their perahus not far from that little house.
The next day His Majesty sent a royal ceremonial perahu (on which was a small pyramidal house) to the poor woman's simple little house where he had lodged at night. This was the same perahu and the same little house that carried the king's mother or first wife on great feast days. Besides this, the clothes which Their Majesties had worn were also on board. He instructed to servants that after presenting these clothes to the old woman, they were conduct her with the royal perahu to court and bring her before him. When the old woman saw the royal servants coming towards her, she became frightened and started trembling, thinking that His Majesty had heard what happened in her home that night. Although these servants reported why they had been sent, the woman could not believe that she would remain unharmed. Furthermore, out of fear she beseeched the servants in a pitiful manner to tell the king that she had died. Meanwhile she wanted to save her life by fleeing to the monks. The servants, however, paid no heed to the woman. Since she did not want to go willingly, they respectfully seized her, clothed her, brought her on the perahu to court, and then presented her to the king.
When His Majesty saw the woman, he took her by the hand and told her that he was the person who had lodged and been cared for at her little house at night. "And because in time of need you accepted me for your son," said the king, "henceforth I will call you Mother and love you for this."
His Majesty ordered a place for the old woman in the palace, and had her served and cared for till the end of her days as if she had been his own mother. At her death she was also cremated as a queen.” [2]
Based on tamnan history, this temple was repaired by King Naresuan and renamed Wat Mae Nang Pluem to commemorate the old lady.