Some of you may have Irish blood in your trees, I have via my Vurriner wife's line. If so then you'll know they can be tricky lines to trace, this weekend's free access from Find My Past may be of help, this week's newsletter states

"With the largest record collection available online, Findmypast is the number one resource for tracing your Irish ancestors. From court and prison registers to newspapers, exclusive land surveys and workhouse records, we show you how find out a lot more than just names and dates. To help you take advantage of our expert tips, we’ve made all 111 million Irish records completely FREE for the next 4 days."

FMP's Irish collections may be accessed here, best opened in a separate window or tab.
http://search.findmypast.ie/search-ireland-records?utm_source=fmp&utm_medium=email&...

Their various collections are summarised here, best to open the link in a new window.
http://www.findmypast.co.uk/irish-ancestors/
http://www.whodoyouthinkyouaremagazine.com/news/findmypast-releases-over-three-million-...

For the Irish Records these research guides are worth-reading.
https://blog.findmypast.co.uk/

I'm not a regular subscriber to FMP, except on occasional free or reduced-price offers such as this; I recommend all users sign-up for their interesting weekly newsletters, plus of course advance notice of offers like this.