The meaning of 'cause'

The meaning of 'cause'

The passage below is from two different translated versions of On the shortness of life by Seneca

?. C. D. N. Costa
?. Aubrey Stewart

?. VI. Livius Drusus, a bold and vigorous man, had proposed laws which renewed the evil policy of the Gracchi, and he was supported by a huge crowd from all over Italy. But he could see no successful outcome for his measures, which he could neither carry through nor abandon once embarked upon; and he is said to have cursed the turbulent life he had always lived, saying that he alone had never had a holiday even as a child. For while still a ward and dressed as a youth he ventured to speak to a jury in favour of some accused men, and to acquire influence in the law courts, with so much effect that, as we all know, he forced certain verdicts favourable to his clients.

?. VI. When Livius Drusus, a vigorous and energetic man, brought forward bills for new laws and radical measures of the Gracchus pattern, being the centre of a vast mob of all the peoples of Italy, and seeing no way to solve the question, since he was not allowed to deal with it as he wished, and yet was not free to throw it up after having once taken part in it, complained bitterly of his life, which had been one of unrest from the very cradle, and said, we are told, that he was the only person who had never had any holidays even when he was a boy."
Indeed, while he was still under age and wearing the praetexta, he had the courage to plead the cause of accused persons in court, and to make use of his influence so powerfully that it is well known that in some causeshis exertions gained a verdict.

In this passages I have two underlined part which I don't understand.

There two translated versions of this book.
#1 version I can figure the meaning of the underlined part.
But the same part of #2 version which is supposed to have the same meaning since the two are translated from the same original book seems quite different.

In this second version the two underlined 'cause' have the same meaning.
(Am I right?)

If it is, what is the specific meaning of the 'cause'?

http://www.thefreedictionary.com/cause

1. a person, thing, event, state, or action that produces an effect
2. grounds for action; motive;justification:
? she had good cause to shout like that.
3. the ideals, etc, of a group or movement:
? the Communist cause.
4. the welfare or interests of a person or group in a dispute:
? they fought for the miners' cause.
5. a matter of widespread concern or importance:
? the cause of public health.

To me it seems to have the second meaning, 'justification' at first glance.
But on second thought I cannot rule out the possibility that it can be the third meaning, 'the ideals'.

Can you tell me what it is?

Regards.