Sirindhorn

Princess Sirindhorn of Thailand, the Princess Royal and the Princess Debaratana Rajasuda (Thai: มหาจักรีสิรินธร, Thai pronunciation: [mā.hǎː t͡ɕàk.krīː sì.rīn.tʰɔ̄ːn]; RTGS: Maha Chakkri Sirinthon; born April 2, 1955), formerly Princess Sirindhorn Debaratanasuda Kitivadhanadulsobhak (Thai: สมเด็จพระเจ้าลูกเธอ เจ้าฟ้าสิรินธรเทพรัตนสุดา กิติวัฒนาดุลโสภาคย์; RTGS: Sirinthontheppharattanasuda Kitiwatthanadunlasophak), is the second daughter of King Bhumibol Adulyadej and younger sister of King Vajiralongkorn. Thais commonly refer to her as "Phra Thep" (Thai: พระเทพ), meaning "princess angel". Her title in Thai is the female equivalent of the title once held by her brother, King Maha Vajiralongkorn. The Thai constitution was altered in 1974 to allow for female succession, thus making her eligible for the throne. Having been the eldest female child of the royal family (excluding Princess Ubolratana Rajakanya, who married a foreign commoner), her position is comparable to a princess royal.