He was the only son of Maharaja Rana Shri Bhavsinhji Madhavsinhji Sahib Bahadur, Rana Sahib of Porbandar, by his third wife, Maharani Bama Sahib Ramba Kunverba Sahiba of Bhavnagar State.[1]
He was educated at the Rajkumar College at Rajkot and stood first in the diploma examination for all the Princes' colleges in India. He succeeded his father on his death on 10 December 1908 and ascended the throne on 26 January 1920 after he came of age.[1]
He married twice, but had no children. He first married Rupaliba Sahiba (1898–1943) of Limbdi State in 1920 and, after her death, Anant Kunverba alias Annette de Silva (1911–1989) in 1954.[1]
Natwarsinhji was an avid painter, author and musician; his literary works include "From the Flow of Life" (1967), "India's Problems: Reflections of an Ex-Ruler" (1970) and "International Solidarity" (1975). He was the joint composer with AW Hansen, of Great Britain of the "Oriental Moon Waltz" in 1930.[6]
Maharaja Sir Natwarsinhji Jethwa of Porbandar died in 1979 after a 71-year reign, aged 78. Although he had adopted a son, Rajkumar Udaibhansinhji Jethwa, in 1941, he died in 1977 with no issue; therefore, the headship of the dynasty is still uncertain after decades.[2]
^ abcKutch Gurjar Kshatriyas : A brief history & glory: Section: History of Rajput Surnames, their origin and myths : sub-section : History of Jethwas : by Raja Pawan Jethwa (2007). pp 81–82.
^Fernando Franco, Jyotsna Macwan, Suguna Ramanathan (2004). Journeys to freedom: Dalit narratives. Popular Prakashan. p. 210. ISBN8185604657. The Maharana Mills was opened by Nanji Kalidas. His Highness gave him the land at one rupee per square yard. The aim was to lead the city and its subjects to prosperity{{cite book}}: CS1 maint: multiple names: authors list (link)