The Heineken Cup is for clubs and provinces, not national teams, so Ireland did not play in the Heineken Cup in 2000. Munster, one of the teams from Ireland, were the beaten finalists in the 2000 final.
Ireland has many rugby teams. However, what you are probably referring to is why there is not a Republic of Ireland and a Northern Ireland team. The reason is that, like many sports in Ireland, rugby is played on an all-Ireland basis and there one organisation that looks after it, the Irish Rugby Football Union, and so there is one international team.
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Ireland's National rugby squad doesn't have a nickname
Brian O'Driscoll
Declan Kidney.
brian o'driscoll ronnon o'gara
It's Brian O'Driscoll
Brian O'Driscoll.
Munster rugby who won 2 Heineken cups beating off Toulouse and Biarritz .
England, Wales, Scotland and Ireland.
The Ulster rugby team were runners up in the Heineken Cup league in 2011-12. In 2012 itself they won an amazing 13 games in a row which is the longest unbroken run of wins in their history.
Keith Wood