Riagan mac Dúnlainge

Riagan mac Dúnlainge (sometimes spelled Riacán; patronymic sometimes spelled Dúngaile) was king of Osraige from 888 to 894 AD.[1]

Riagan mac Dúnlainge
King of Osraige
Reign888–894
PredecessorCerball mac Dúnlainge
SuccessorDiarmait mac Cerbaill
HouseDál Birn
FatherDúngal mac Fergaile

History

King Riagan was the son of king Dúngal mac Fergaile, of the Dál Birn lineage of Osraige. He peacefully succeeded to the throne of Osraige upon the death of his older brother Cerball mac Dúnlainge in 888.[2] He was also brother to the influential princess Land ingen Dúngaile. William Carrigan states that Riagan must have been aged upon ascending the throne, as his brother's famous reign lasted over forty years. The Annals of the Four Masters record him winning a victory over the Vikings of Waterford:[3]

FM888.6: A battle was gained by Riagan, son of Dunghal, over the foreigners of Port Lairge, Loch Carman, and Teach Moling, in which two hundred heads were left behind.

Whether king Riagan died or abdicated on account of age is not known; he was succeeded by his nephew Diarmait mac Cerbaill.

gollark: There are some important considerations here: it should be able to deal with damaged/partial files, encryption would be nice to have (it would probably work to just run it through authenticated AES-whatever when writing), adding new files shouldn't require tons of seeking, and it might be necessary to store backups on FAT32 disks so maybe it needs to be able of using multiple files somehow.
gollark: Hmm, so, designoidal idea:- files have the following metadata: filename, last modified time, maybe permissions (I may not actually need this), size, checksum, flags (in case I need this later; probably just compression format?)- each version of a file in an archive has this metadata in front of it- when all the files in some set of data are archived, a header gets written to the end with all the file metadata plus positions- when backup is rerun, the system™ just checks the last modified time of everything and sees if its local copies are newer, and if so appends them to the end; when it is done a new header is added containing all the files- when a backup needs to be extracted, it just reads the end and decompresses stuff at the right offset
gollark: I don't know what you mean "dofs", data offsets?
gollark: Well, this will of course be rustaceous.
gollark: So that makes sense.

References
  1. William Carrigan. The History and Antiquities of the Diocese of Ossory, vol. I (1905). p 41. https://books.google.com/books?id=74QNAAAAYAAJ&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false
  2. Early Irish Regnal Succession: A Case Study; by Jim Reid. https://www.academia.edu/6401329/Early_Irish_Regnal_Succession_A_Case_Study
  3. FM888.6
Regnal titles
Preceded by
Cerball mac Dúnlainge		 King of Osraige
888-894		 Succeeded by
Diarmait mac Cerbaill
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