The History of Humāyūn (Gulbadan Begam) 142: CLXI. Rabī'a-sultān Begam Bāīqul and Bedka Begam Bāīqul.

142

These two names may indicate the same person. The Memoirs (176 and 177) say that Sultān Husain Mīrzā Bāīqul had two full-sisters, Ākā and Bedka, and that Bedka married Ahmad Hājī Tarkhān, and had two sons who served Sultān Husain.
These statements are contained also in the Turkī texts (B.M. Add. 26,324, and Ilminsky), and also in a considerable number of good Persian texts in the British Museum and Bodleian.
There is, however, this difference of statement. The Turki texts write Bedka Begam ham mirza ning aka-chi si aldi. P. de C. translates etait aussi l'ainee du mirza. The Persian texts have Bedka Begam ki khwahar-i-khurd mirza bud, and from this Mr. Erskine translates the mirza's younger sister. The Turki, it should be observed, uses of Aka precisely the same word as of Bedka, aka-chi si. It may be right to regard Bedka as the younger of the two sisters of the mirza, and not as the sister younger than the mirza.
To pass now to what has led me to make a tentative identification of Bedka with Rabi'a-sultan. The Memoirs mention Rabi'a-sultan as the younger sister of the mirza (Husain) and as having two sons, Babar and Murad who were given in marriage to two daughters of Husain.
The Turki texts do not describe Rabi'a-sultan in any way, or say that she was Husain's sister. They simply mention the marriages.
The Persian texts say of Husain's two daughters (Bega and Agha) ba pisaran-i-khwahar-i-khurd-i-khudish Rabi'a-sultan Begam, Babar Mirza wa Sultan Murad Mirza, dada budand.
The Persian texts which state that Rabi'a-sultan was Husain's own sister, have greater authority than most translations can claim for such additional information as is here given, because the Persian translation of the Tuzuk-i-babari was made in a court circle and at a date when such additional statements were likely to be known to many living persons.
Husain may have had a younger and half-sister, but the words in the Persian texts which are used of Rabi'a-sultan are those used of Bedka, and they are more applicable to a full than a half sister.
The Aka of the passage in which Bedka is mentioned has no personal name recorded. Bedka may be a word of the same class as aka, i.e., a title or sobriquet, and Rabi'a-sultan may be the personal name of Bedka. Perhaps the word Bedka is Bega.
The facts of Bedka's descent are as follows: she was a daughter of Mansūr Mīrzā Bāy-qarā and of Fīroza Begam Mīrān-shāhī, and thus doubly a Timurid. She was full-sister of Bāy-qarā and Husain Mīrzās and of Ākā Begam. She married Ahmad Khān H(ā)jī Tarkhān, and had two sons whose names (if Bedka be Rabī'a-sultan) were Bābur and Murād and who married two of her nieces, Bega and Āghā.
Mems., 176, 177, 181. Ilminsky, 203, 204, 208. BM. Turki Add. 20,284, f. 48 and b, 68. Other texts under 911H.