Sorry for that logo on the left, it's the only way Robert Lentz will let his icons be reproduced.
[Ooops, I originally posted this a day early! I meant to post it on the 29th, which is Sunday. I've just moved it to the proper day. Catherine' s feast is the 29th, but in some churches the 30th. Never on the 28th, though.]
Today (or in some churches tomorrow) is the feast of Catherine of Siena, one of the several great mystics of the 14th century, who was also a church reformer and supporter of church authority (yes, both).
More on her later perhaps, but here are some links.
Profile from the online Daily Office
and the same profile by James Kiefer here (the original place of publication, I think)
A somewhat traditional Catholic perspective.
And another profile of Catherine.