The Sinclairs

Crest mermaid

This website is very much work in progress. It contains historical and genealogical details about the Sinclairs, in particular, the Anglo-Norman Saint Clairs in England, the Rosslyn branch in Scotland, and those Irish Sinclairs who might have been descended from the Rosslyn branch.

Every effort has been made to provide information based on historically verified documentation and updated with more recent academic research (see Sources of information). However, histories of families in Ireland are notoriously difficult to research because of the loss of so many official records in Dublin in 1922, and church records only began in the 1700s. Fortunately, in Scotland the history of the Rosslyn Sinclairs prior to 1700 has been well documented by the Scottish family's celebrated genealogist, Father Hay.

Information is presented geographically because the family's unique history has been formed by past Sinclairs making periodic decisions to change their lives and circumstances: the Viking settlement of Normandy, the Norman invasion of England, establishing themselves in Scotland, planting in Ireland, and moving to England. Emigration to countries like America, Canada and Australia has also been the start of a significant new period of change.

Newsletters and contact

A newsletter is published occasionally, providing details about new research. It can be subscribed or unsubscribed easily, and there is also an archive of previous issues. A password-protected guestbook is only available to the Newry Sinclair family.


The search facility is useful if you would like to find out whether a name or place has been mentioned on the website. The best way to use it is to tick "Page" in the "Advanced search" because this avoids returns that may be inaccessible or have little useful information.

Family Tree

Descendant tables for the principal male lines of other Irish Sinclair families are provided where they are known. This is not to detract from the contributions made by wives and daughters, but their lack of visibility in early records makes it difficult to trace their lineages further back than a few generations. The only complete family tree is that of the Newry Sinclairs and this is password protected, but there are separate pages for related families.


See Medieval Walkern and Magna Carta, a new book about the history of Saint Clair and the Lanvalei families was published by the Walkern History Society in October 2013, and is also available as a digital book.