General error when trying to access templates

Running EE 3.5.12

In the process of creating a number of new templates I suddenly got the following error:

SQLSTATE[HY000]: General error: 1366 Incorrect string value: ‘\xD5ve fo…’ for column ‘template_data’ at row 1:

ee/legacy/database/drivers/mysqli/mysqli_connection.php:122 I checked the template_data column contents of the most recent templates in exp_templates and could not see anything amiss.

I would appreciate any guidance on what might be causing this and how to resolve it.