Prince Henry has been drinking every since King Henry IV, Part I:

Scene II London. The palace

KING HENRY IV (Prince Henry;s Dad)::

I know not whether God will have it so,
For some displeasing service I have done,
That, in his secret doom, out of my blood
He'll breed revengement and a scourge for me;
But thou dost in thy passages of life
Make me believe that thou art only mark'd
For the hot vengeance and the rod of heaven
To punish my mistreadings. Tell me else,
Could such inordinate and low desires,
Such poor, such bare, such lewd, such mean attempts,
Such barren pleasures, rude society,
As thou art match'd withal and grafted to,
Accompany the greatness of thy blood
And hold their level with thy princely heart?


PRINCE HENRY :

So please your majesty, I would I could
Quit all offences with as clear excuse
As well as I am doubtless I can purge
Myself of many I am charged withal:
Yet such extenuation let me beg,
As, in reproof of many tales devised,
which oft the ear of greatness needs must hear,
By smiling pick-thanks and base news-mongers,
I may, for some things true, wherein my youth
Hath faulty wander'd and irregular,
Find pardon on my true submission.

--W. Shakespeare