THE CENTURY BANCORP SUPPLEMENTAL EXECUTIVE RETIREMENT AND INSURANCE PLAN First Amendment

Exhibit 99.1

THE CENTURY BANCORP
SUPPLEMENTAL EXECUTIVE RETIREMENT
AND INSURANCE PLAN

First Amendment

      PURSUANT to Section 8.4 of the Century Bancorp Supplemental Executive Retirement and Insurance Plan, as amended and restated effective as of December 1, 2008 (the “ Plan ”), Century Bancorp, Inc. hereby amends Section 6.1 of the Plan to read in its entirety as follows, effective generally as of May 12, 2009 but only as to Participants who die on or after that date:

     6.1 IN GENERAL

     No benefits are payable upon death under this Plan, except as follows:

     (a) DEATH AFTER COMMENCEMENT OF BENEFITS

In the case of a Participant who dies after the commencement of his retirement benefits under the Plan, payment of such benefits shall continue after the Participant’s death, if at all, only to the extent provided under the form of retirement benefit elected under Article V hereof.

     (b) DEATH BEFORE COMMENCEMENT OF BENEFITS

(1) In the case of a Participant who dies before the commencement of his retirement benefits under the Plan, and before termination of employment, no benefits shall be payable under the Plan on account of the Participant’s death. In that event, the Participant’s Beneficiary or estate shall have the rights, if any, specified in the life insurance policies required to be purchased and maintained pursuant to the other provisions of this Article VI.

(2) In the case of a Participant who dies before the commencement of his retirement benefits under the Plan, but after termination of employment, then i. or ii. below, whichever is applicable, shall apply: