Galba was a straight-laced disciplinarian and his failure to sufficiently reward legions who had rebelled against Nero and the Praetorian guard soon made him unpopular.
The class was quiet as it entered the room; Professor Umbridge was, as yet, an unknown quantity and nobody knew how strict a disciplinarian she was likely to be.
And some fathers are disciplinarians. They have strict rules and they give out punishments. But these days more fathers are hands-on, which means they are 'very much involved' in looking after and bringing up their children.
The ship was one of a new class of torpedo carriage ships and Queen Victoria was much concerned that her two grandsons would be lost at sea, but their father, a stern disciplinarian, stated that they needed to see the world.