In certain tribal regions and rural areas there is a custom known as "Pait Likkhi" (Urdu: پیٹ لکھی) (Pait (Urdu: پیٹ ) means "stomach" and Likkhi (Urdu: لکھی) means "written;" literally written on stomach).
This involves two families agreeing to marry their children while they are still infants, or even before they are born.
The actual marriage takes place when groom and bride are in their late teens or adults.
"Watta satta" (Urdu: وٹہ سٹہ, literally "give" and "take") is the custom of exchange brides between two clans.
The monarchs of Europe were all related by blood due to frequent diplomatic marriages.