160
Śrīmad-Bhāgavatam
[Canto 9, Ch. 22]
yudhi —in a fight;  toṣitaḥ —was satisfied (when defeated by Bhiṣmadeva);  śāntanoḥ —by Śāntanu;  dāsa-kanyāyām —in the womb of Satyavati, who was known as the daughter of a  śūdra ;  jajñe —was born;  citrāṅgadaḥ —Citrāṅgada;  sutaḥ —a son.
TRANSLATION
Bhiṣmadeva was the foremost of all warriors. When he defeated Lord Paraśurāma in a fight, Lord Paraśurāma was very satisfied with him. By the semen of Śāntanu in the womb of Satyavati, the daughter of a fisherman, Citrāṅgada took birth.
PURPORT
Satyavati was actually the daughter of Uparicara Vasu by the womb of a fisherwoman known as Matsyagarbhā. Later, Satyavati was raised by a fisherman.
The fight between Paraśurāma and Bhiṣmadeva concerns three daughters of Kaśīrāja—Ambikā, Ambālikā and Ambā—who were forcibly abducted by Bhiṣmadeva, acting on behalf of his brother Vicitravīrya. Ambā thought that Bhiṣmadeva would marry her and became attached to him, but Bhiṣmadeva refused to marry her, for he had taken the vow of  brahmacarya . Ambā therefore approached Bhiṣmadeva's military spiritual master, Paraśurāma, who instructed Bhiṣma to marry her. Bhiṣmadeva refused, and therefore Paraśurāma fought with him to force him to accept the marriage. But Paraśurāma was defeated, and he was pleased with Bhiṣma.
TEXTS 21–24
विचित्रवीर्यश्चावरजो नाम्ना चित्राङ्गदो हतः । 
    यस्यां पराशरात् साक्षादवतीर्णो हरेः कला ॥२१॥ 
    वेदगुप्तो मुनिः कृष्णो यतोऽहमिदमध्यगाम् । 
    हित्वा स्वशिष्यान् पैलादीन् भगवान् बादरायणः ॥ २२॥ 
    मह्यं पुत्राय शान्ताय परं गुह्यमिदं जगौ । 
    विचित्रवीर्योऽथोवाह काशीराजसुते बलात् ॥२३॥