From about 1850 onwards the London Royal Society published obituaries of their fellows.
From 1934 onwards these were presented in separate volumes.

More than 270 mathematicians in our archive have such obituaries.

Because of the way the older obituaries are presented, it may be necessary to scroll down past other entries.

A list of the obituaries in Chronological order of their publication is at THIS LINK.

Click on the name for the MacTutor biography and on RSO for the Royal Society obituary.