1160), sometimes referred to as Ferchar or Ferquhard, is the second-known earl or mormaer of Strathearn, a region in central Scotland.
His name likely derives from the Gaelic Fer Téid, "Teith Man".
On this occasion he, with the help of five other earls, besieged King Malcolm in Perth Castle.
The reason for this is not clear, but it may have been a protest against Malcolm's friendship with Henry II of England, which they believed might lead to Scotland becoming an English vassal.
Ferteth took a great interest in ecclesiastical affairs, and it was largely due to his influence that Strathearn was made a separate diocese, headed by the Bishops of Dunblane.