SB 10.90.36

sa rukmiṇo duhitaram
 upayeme mahā-rathaḥ
tasyāṁ tato ’niruddho ’bhūt
 nāgāyata-balānvitaḥ
Synonyms: 
saḥ — He (Pradyumna); rukmiṇaḥ — of Rukmī (the oldest brother of Rukmiṇī); duhitaram — the daughter, Rukmavatī; upayeme — married; mahā-rathaḥ — the great chariot warrior; tasyām — in her; tataḥ — then; aniruddhaḥ — Aniruddha; abhūt — was born; nāga — of elephants; ayuta — ten thousand; bala — with the strength; anvitaḥ — endowed.
Translation: 
The great warrior Pradyumna married Rukmī’s daughter [Rukmavatī], who gave birth to Aniruddha. He was as strong as ten thousand elephants.