There was a very specific reference to Ireland in Theresa May’s Brexit letter to the EU

This could be very good news for Irish people worried about the impact of Brexit.

Charlie Flanagan, Ireland's Minister for Foreign Affairs, has shared a passage from British Prime Minister Theresa May's letter to Donald Tusk triggering the United Kingdom's exit from the European Union. It makes for good reading from an Irish perspective, with May claiming a hard border between Ireland and the United Kingdom should not be put in place and the common travel area between the countries maintained at all costs. She also insists that nothing should be done to harm the peace process in Northern Ireland. In the section, May writes:

In particular, we must pay attention to the UK's unique relationship with the Republic of Ireland and the importance of the peace process in Northern Ireland. The Republic of Ireland is the only EU member state with a land border with the United Kingdom. We want to avoid a return to a hard border between our two countries, to be able to maintain the Common Travel Area between us, and to make sure that the UK's withdrawal from the EU does not harm the Republic of Ireland. We also have an important responsibility to make sure that nothing is done to jeopardise the peace process in Northern Ireland, and to continue to uphold the Belfast Agreement.

https://twitter.com/CharlieFlanagan/status/847058577672093697