People who take care of swans.
It's a job that takes care of animals, so it's usually seen as kind and gentle.
Examples:
The swanherds feed the swans every day.
The swanherds make sure the swans are safe.
The swanherds love the swans very much.
The swanherds tell the swans bedtime stories.
The swanherds are like the kings and queens of the swans.
The swanherds and the swans have a big party together.