From the publisher's website:

Tara is a collection of multi award-winning games steeped in the ancient legends of Ireland’s Celtic heritage and royal past. Standing atop the Hill of Tara and contemplating the conjoined ringforts of Forradh and Teach Chormac, the games of Sacred Hill and High Kings of Tara were born. These unique games of pure, 3-dimensional strategy are appreciated by young and old alike; easy to learn, yet a lifetime to master, this is truly a gift to treasure and a ‘classic’ in the making. Three further games have been added which can be played with the same components: Four Treasures, Poisoned Chalice and Stone of Destiny. All five games can be played with just the one box of components. Of course, there is a rules booklet in the box which explains everything, but the Four Treasures rules (the newest game) are only available on this website. As the various games of Tara have been developed, one or two of the rules have been standardized in order to make the experience of moving from one game to another as seamless as possible. So for the most up to date rules just check out this website - and keep coming back - and follow us on Facebook and Twitter, because more info, strategies and doubles games etc. etc. are being added regularly!