handed down (?.)

• acknowledged
• admitted
• conventional
• customary
• established
• fixed
• folk
• hallowed
• heroic
• hoary
• immemorial
• inveterate
• legendary
• long-established
• long-standing
• mythological
• of long standing
• of the folk
• oral
• prescriptive
• received
• recognized
• rooted
• time-honored
• traditional
• tried and true
• true-blue
• understood
• unwritten
• venerable
• worshipful