Herb Robert (Geranium robertianum), called ruprechtskraut in German, is sometimes said to derive its name from the seventh-century Saint Rupert or Robert of Salzburg, but the plant is also associated with the German hobgoblin Knecht Ruprecht and his English counterpart, Robin Goodfellow.
Either I mistake your shape and making quite,
Or else you are that shrewd and knavish sprite
Call’d Robin Goodfellow: are not you he
That frights the maidens of the villagery;
Skim milk, and sometimes labour in the quern
And bootless make the breathless housewife churn;
And sometime make the drink to bear no barm;
Mislead night-wanderers, laughing at their harm?
Those that Hobgoblin call you and sweet Puck,
You do their work, and they shall have good luck:
Are not you he?
A Midsummer Night’s Dream, Act II, Scene 1