I have gleaned some of my information on the McGoverns.

It was Joseph Henry, as far as I know, who claimed the seventh King of Scotland, Aidan Gabhran, was a McGovern, and one of the three septs, or branches, of the McGoverns.  The others are from Tullyhaw and, according to Joseph Henry, one centered around Kilkenny and was connected with the Kings of Ossory. 

First, to the seventh king of Scotland, Aidan McGovern.

THE IRISH INVASIONS OF SCOTLAND, THE DALRIADA AND AIDAN MCGOVERN,
SEVENTH KING OF SCOTLAND.

Much has been written, and almost everyone with a faint knowledge of Irish history, has heard of the invasions of Ireland by the Vikings, Danes, Normans and others.

However, not so much has been written or understood about the reverse, the Irish invasions (migrations, some called them) of or to, Scotland.

In fact, the Scots are called so because they were celtic scotti from Dalriada, an area of Antrim in northeastern Ireland.  From about the middle of the 3rd century Latin writings make frequent reference to raiding expeditions carried out by the Irish, who were now given the name Scotti, rather than the older one, Hiberni. (Scotti is a corruption of the Irish word for 'raider').

Native Irish traditions also suggest such attacks took place. In the second half of the 4th century, when Roman power in Britain was beginning to crumble seriously, the raids became incessant and settlements were made along the west coast of Britain and extensively in Wales and Scotland.

From the early 5th century the rulers of Dairiada in northern Antrim extended their power over the Irish already settled in Argyll and the neighboring islands.  Ultimately, the Scottish kingdom of Dalriada became separated from the Irish. And when, in the 9^th century, it overcame the Picts, it gave its name, Scotland, to the whole area.

According to Joseph Henry McGovern, one Aiden or Aidan M'Gabhran was venerated in the North (of Scotland) as one of the founders if the Scottish monarchy

It was St. Columba who went with the Dalriada to Scotland who selected Aidan to be King of Scotland.  He is reported to have said to Aidan, 'Believe firmly, O Aidan, that none of your enemies will be able to resist you unless you first deal falsely against me and my successors’.  And to that he added, 'or my relatives (The O'Neills) in Ireland’.