We have inherited from our forbearers a heritage of sacred traditions: the faith of the Holy Orthodox Church and the ideals and culture of the Greek people. Through the centuries, much of the greatness of Western civilization has evolved from this proud heritage. When our parents (or grandparents) left their beloved Greece for a new life in America, their faith, ideals and culture gave them the strength to adapt swiftly – to learn a new language and find a productive place in this challenging new world. They were mostly poor and uneducated, but they were proud of their roots and determined to succeed. And succeed they did - the vitality of Holy Trinity today is the legacy of the tenacity of those who came before to make a new life for their family's future.
| 1922 | Contilia Lazarus organizes the first group of approximately 30 families from Mt. Vernon, New Rochelle, Yonkers and White Plains in her Mt. Vernon home to discuss the formation of a Greek Orthodox community. |
| 1924 | First group rents a storefront in Genung's Department Store and assigns the name of Holy Trinity |
| 1928 |
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| 1934 | Holy Trinity moves to another rented space on 119 S. 4th Avenue. |
| 1940 | First Church building of significance is purchased: "Wooden" Church on N. High and Oak Street. |
| 1942 | Fire destroys "Wooden" Church before Easter. Holy Week services were held in the basement of the Masonic Temple in Mt. Vernon |
| 1942-1948 | Congregation rents a house on Second Avenue, Services were conducted in the livingroom; the entryway served as the Narthex; and Sunday School and Greek School classes took place in the diningroom, Fr. Papachristou lived upstairs |
| 1948 | Holy Trinity purchased the "White" Church from a Protestant community. This building was considered by many to be Holy Trinity's dream facility |
| 1958 | Building fund is organized and property is purchased on Mill Road and North Avenue in New Rochelle. |
| 1961 | AHEPA Evzone Chapter 405 is founded |
| 1962 | Ground is broken in New Rochelle for the new Community Center which also served as the Church until 1973. |
| 1964 | Doors open at the new Church and Community Center. |
| 1971 | Cornerstone is layed for the present day Church building. |
| 1973 | Archbishop lakovos blesses the new Church and the doors are opened. |
| 1978 | Holy Trinity's present Church building is consecrated. |
| 1979 | Fire severely damages the Church shortly before Christmas. Services are held in the Social Hall until repairs are completed |
| 1986 | Approval for the expansion, remodeling and redecorating of the Social Hall is given as well as approval for the construction of a gym. |
| 1987 | Ground is broken for the new gym and renovated community center. |
| 1990 | The new, expanded and redecorated facilities are officially opened and dedicated |