By the 12th century Glasgow had been granted the status of what can now be called a city and the cathedral was the seat of the Bishops and (after 1472) the Archbishops of Glasgow. While there may have been wooden buildings on the site, the first stone cathedral was consecrated in about 1136 and replaced by a bigger one which was consecrated in 1197. In the 15th century a private chapel was made to St Machan in the north nave to devolve to the congregation at the death of the founder.[4] Extensions and alterations to the cathedral buildings have continued ever since.