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In AD 728 we find the first mention of the name Moncrief (Monaigh craebi) (Monidcroib) comes at the battle fought at Moncrief a Hill to the North West of Abernethy between the Tay and the Earn between Aengus and Alpin in which Aengus was victorious.
 
FROM THE ANNALS OF TIGHERNAC FROM THE ANNALS OF TIGHERNAC FROM THE ANNALS OF ULSTER
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Cath Monaigh craebi itir Picardachaib fein. i. Aengus 7 Alpine issiat tuc in cath 7 ro mebaigh ria n-Aengus gus 7 n0 marbhadh mac Ailpin andsin 7 ro gab Aengus nert. 

 7= and

 The battle of Monaigh craebi between the Picardachaib themselves. Angus and Alpin  fought that battle, and the victory was with Angus; and the son of Alpin was slain there, and Angus took his power. 
 		 728  Kal. Jan.   Anno Dommini Dccxxvij 

Bellum Monidcroib inter Pictores invicem ubi Oengus victor fuit et multiexparte Eilpini regis perempti sunt. Bellum lacrimabile inter eosdem gestum est juxta Castellum Credi ubi Elpinius effugit. 

 

Did You Know that in his book "Macbeth the King", Nigel Tranter has a fictitious battle between Macbeth and Siward on the banks of the river Earn at Moncrieffe Hill?