100 years at Mount captures the pride and privilege associated with being a Thomian. It is a book that captures the glory of one of the best schools in the country. The Book 100 Years at Mount is in two main parts. Part 1 is the original 75 Years at Mount fully revised and expanded slightly by Rev Billimoria himself. The Book also contains photographs of all the Bishops of Colombo, Wardens, Sub Wardens, Heads of Sections from 1918 to date as well as of the various buildings. As appendices there are important lists of names as well. Part 2 contains the last 25 years in chronological order and this section has been compiled by a committee led by SidathGajanayake and OshanthakaCabraal two outstanding recent products of the school. This book covers the history of S.T.C. in Mount Lavinia from 1918. The School shifted from Mutwal to Mount Lavinia on the January 26, 1918. So from there onwards till the end of 2017 is covered in Part 2 of the book.