Meanings (ES + gloss)
afirmar
To state under oath, to plead.
alegar
To adduce (something) as a reason, excuse, support etc.
I will further alleage a storie[…]to make us palpably feele his naturall condition.
afirmar • alegar
To make a claim as justification or proof; to make an assertion without proof.
The agency alleged that my credit history had problems.