They were the eighth and ninth drink-drive offences for the 45-year-old, who was jailed for two-and-a-half years in the Royal Court.
Judge Russell Finch also banned him from driving for 15 years in a bid to protect the public.
Byrne, who had previously given his address as Naigy Contan, Retot, Castel, pleaded guilty to two counts of drink-driving, two of driving without insurance and two of driving while disqualified.
The 10-year driving ban was imposed on 20 September 2007 for drink-driving.
Prior to that he had 50 driving offences on his record from between 1988 and 2007. They include 10 for driving while disqualified, six for drink-driving and 13 for driving without insurance.
Full story in today's Guernsey Press
You need to be logged in to comment. If you had an account on our previous site, you can migrate your old account and comment profile to this site by visiting this page and entering the email address for your old account. We'll then send you an email with a link to follow to complete the process.