This Endris Night is a 15th-century English

English language

English is a West Germanic language that arose in the Anglo-Saxon kingdoms of England and spread into what was to become south-east Scotland under the influence of the Anglian medieval kingdom of Northumbria...

 Christmas carol. It has also appeared under various other spellings. Two versions from the 15th-century survive, one republished in Thomas Wright, Songs and Carols Now First Printed, From a Manuscript of the Fifteenth Century (London: The Percy Society, 1847), and the other in the possession of the Advocates' Library

Advocates' Library

The Advocates' Library is a law library belonging to the Faculty of Advocates in Edinburgh, founded in 1682. Until 1925 it was the deposit library for Scotland, after which the role was taken on by the National Library of Scotland....

 in Edinburgh

Edinburgh

Edinburgh is the capital city of Scotland, the second largest city in Scotland, and the eighth most populous in the United Kingdom. The City of Edinburgh Council governs one of Scotland's 32 local government council areas. The council area includes urban Edinburgh and a rural area...

, Scotland

Scotland

Scotland is a country that is part of the United Kingdom. Occupying the northern third of the island of Great Britain, it shares a border with England to the south and is bounded by the North Sea to the east, the Atlantic Ocean to the north and west, and the North Channel and Irish Sea to the...

, a legal deposit

Legal deposit

Legal deposit is a legal requirement that a person or group submit copies of their publications to a repository, usually a library. The requirement is mostly limited to books and periodicals. The number of copies varies and can range from one to 19 . Typically, the national library is one of the...

 belonging to the Faculty of Advocates

Faculty of Advocates

The Faculty of Advocates is an independent body of lawyers who have been admitted to practise as advocates before the courts of Scotland, especially the Court of Session and the High Court of Justiciary...

, a role which was assumed by the National Library of Scotland

National Library of Scotland

The National Library of Scotland is the legal deposit library of Scotland and is one of the country's National Collections. It is based in a collection of buildings in Edinburgh city centre. The headquarters is on George IV Bridge, between the Old Town and the university quarter...

from 1925 onwards. All non-legal collections where gifted to the National Library.

It has been praised for the unusual delicacy and lyrical flourish for a poem of the period.
The opening lyrics, in the Wright edition, are:

Thys endris nygth

I saw a sygth,

A stare as brygt as day;

And ever among

A mayden song

Lullay, by by, lullay.

It is rarely performed now.