Former Labour TD, Mr Declan Bree and Fine Gael councillor Mr Martin Brett are among the first mayors to be appointed following the local elections ten days ago.
Mr Bree was elected unanimously on Sligo Borough Council under the terms of a new power-sharing arrangement between Labour and Fianna Fáil.
On Kilkenny Borough Council, Fine Gael and Labour today agreed to share power, alternating the mayoralty in an arrangement likely to be repeated throughout the State.
Mr Brett's appointment as Kilkenny's mayor marks one of the first outcomes of a week of intense lobbying and negotiation as parties share the spoils of a vote that saw Fianna Fáil lose 82 seats on local authorities.
The result has put Fine Gael, in particular, in a position to head up coalitions excluding the State's largest party. The Labour Party will also become the senior partner in a number of local authority deals.
Over the course of this week announcements of new alliances and old ones reformed will come thick and fast.
This evening a break with a 10-year tradition is on the cards on Dublin City Council. Labour has usurped Fianna Fáil as the largest party and is in a position to invite Fine Gael and the Greens into a pact.
Talks to this end have been ongoing and an announcement is expected this evening but is not a foregone conclusion. Labour may yet opt to stick with the existing deal and another, though less likely possibility, is the "Guns and Roses" option.
At national political level, coalition with Sinn Féin is categorically ruled out by all the major parties, bit co-operation at local level is common. Of the 52 seats on the council, Labour hold 15 and Sinn Féin hold ten. With three independents all left-leaning, the support of two would create a majority.
Current Lord Mayor of Dublin, Fianna Fáil's Royston Brady, will tonight lose the mayoral chain but it is not clear if he will appear at tonight's vote.
The share out of power on Cork City Council is also due to be decided this evening. Fine Gael and Labour held control before the election and a similar agreement is expected this evening.
On Limerick City Council, where Fianna Fáil were slaughtered, Fine Gael have five seats and Labour have four of the 17 seats making a simple bipartite arrangement the likely option.
Fine Gael and Labour are also expected to come to an arrangement on county councils during the course of the week. Power-sharing arrangements are virtually certain among Fine Gael, Labour and the Greens (with a little assistance from independents) on Dublin's three county council's of Fingal, South Dublin and Dún Laoghaire-Rathdown.
In counties Clare, Carlow, Waterford, Wicklow and Galway, as well as Waterford city, permutations based around Fine Gael/Labour pacts with a help from some new found friends are likely.
By the end of this week, the Opposition will truly be in control of local Government.