Amphorn Sathan Residential Hall

Amphorn Sathan Residential Hall or Ambara Villa (Thai: พระที่นั่งอัมพรสถาน: Phra Thinang Amphorn Sathan) is a royal residential building in Bangkok's Dusit Palace. It serves as the current primary residence of King Maha Vajiralongkorn (Rama X) of Thailand.

Amphorn Sathan Residential Hall was constructed in 1906 in the same year as Vimanmek Mansion was completed. King Chulalongkorn (Rama V) decided to construct another residential hall at the northwest side of Ananta Samakhom Throne Hall which was named the 'Ivory Garden'. The name was changed to the “Amphorn Sathan Residential Hall” or the Phra Thinang Amphorn Sathan; translated as: 'The royal seat in the sky').

Phraya Yommarat, Minister of Civil engineering of Siam was the director of construction in 1906 and celebrated the completion of the new building with a ceremony lasting from 18 to 22 February 1906. King Rama V lived in the residence until his death at the residence in 1910. Both kings Vajiravudh (Rama VI) and Prajadhipok (Rama VII) lived in this residence during their reigns. When King Bhumibol Adulyadej (Rama IX) came back permanently from Switzerland in 1950, he decided to lived in the Amphorn Sathan Residential Hall before his coronation ceremony. As renovations were carried out in the designated royal residence of Chitralada Royal Villa, the king, Queen Sirikit and the growing royal family remained living at the residence. Once renovations were completed at Chitralada in 1957, the king and the royal family moved out. During the royal couple's stay at the hall, three of their children were born here: Prince Vajiralongkorn on 28 July 1952, Princess Sirindhorn 2 April 1955 and Princess Chulabhorn 4 July 1957.

The residence is known to most Thais as the location of many of the king's early musical broadcasts on the radio. In 1952 the king established the A.S. (Amporn Sathan) Radio Station. From the residence the king would jam with various jazz musicians every Friday. Pathorn Srikaranonda, the king's band member remembered that: "Anyone could call in to request music. If the band couldn't play that song, then he would play the record instead. He even answered the phone himself. People didn't know they were speaking to the King as His Majesty didn't like to reveal his presence". The band was called the 'A.S. Friday'.

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