They created purple dye that the Romans copied in their cities. They also had artistic sarcophagi to bury their dead.

explanation below

Explanation:

The Minoans were known as a group of non-Indo-European people who existed on the island of Crete around the Bronze Age.  They were known for the beautiful palaces they built and the public sewers they created which the Romans copied in their cities.

The drainage system arrangement was first practiced by the Minoans for the first time.  

the answer should be monarchy