In this world, there is no such thing as "bride price," a culture familiar to the Outlanders, but there is "dowry." It is a large sum of money that noble families provide as a dowry when their daughters marry. It could be jewelry, property deeds, or even a vast territory.
Especially for the Grand Nobles with notable status, the dowry that a family's daughter receives when she marries is a reflection of the family's strength and face.
Larus III was not marrying off a daughter for the first time, so the dowries for the Princesses of this generation of the Cavendish Family were already established by customary rules.
Curiously, Shard inquired from Dorothy, who counted with her fingers:
