Petre
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Petty-Fitzmaurice (Marquess of Lansdowne)
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Peyton (Castlecarra)
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Peyton (Driney)
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Peyton (Grevisk)
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Peyton (Knockvicar)
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Peyton (Laheen)
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Peyton (Loughscur)
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Peyton (Port)
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Phayre/Phaire
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Phelps
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Phibbs
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Phibbs (Drumlease)
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Phibbs (Seafield)
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Phibbs (Spotfield)
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Phibbs (Tirerrill)
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Phillips
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Phillips
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Phillips (Gaile House)
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Phillips (Glenview)
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Phillips (Mount Rivers)
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Phipps
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Piercy/Piercey
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Piers (Tristernagh)
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Pigot (Park)
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Pigot/Pigott
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Pigott (Chetwynd & Knapton)
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Pigott (Rathkeale)
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Pigott/Pemberton-Pigott (Slevoy Castle)
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Pike
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Pike
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Pike/Pyke
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Pilkington (Abbeyville)
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Pilkington (Tore)
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Pim
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Pim (Co Cork)
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Pim (Co Limerick)
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Pim (Co Roscommon)
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Pitcairn
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Pleydell (Wilton, Somerset)
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Plummer
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Plunket (Baron Plunket)
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Plunkett (Castleplunket)
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Plunkett (Dunkellin)
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Plunkett (Fingall)
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Plunkett (Mountplunkett)
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Plunkett Kenney
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Pocklington
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Poe (Donnybrook & Solsborough)
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Poe (Harley Park)
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Pollard (Castle Pollard)
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Pollexfen
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Pollok (Lismany)
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Pomeroy (Duhallow)
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Pomeroy (Viscount Harberton)
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Ponsonby (Bessborough, Earl of )
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Ponsonby (Imokilly)
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Ponsonby/Carrique-Ponsonby
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Poole (Mayfield)
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Poole (Waterford)
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Pope
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Pope (Cork & Waterford)
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Popham
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Popham (Bandon)
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Porter
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Porter
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Porter (Belle Isle)
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Potter (Knockbride)
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Potter (Mount Potter)
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Potterton (Clerkstown)
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Potts
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Powell
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Powell
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Powell (Clonshavoy)
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Powell (County Kerry)
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Powell (West Carbery)
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Power (Clashmore)
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Power (Clonmult)
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Power (Clonshire & Monroe)
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Power (Decies-without-Drum)
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Power (Faithlegg)
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Power (Galway)
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Power (Gurteen)
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Power (Kilfane & Glencairn Abbey)
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Power (Middlethird)
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Power (Mount Richard)
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Power (Ringacoltig)
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Power (Roskeen)
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Power (Slievardagh)
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Power (Springfield)
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Power O'Shee (Gardenmorris)
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Power/O'Neill Power (Snowhill)
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Praed
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Pratt (Cabra Castle)
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Pratt (Co Cork)
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Pratt (Killynan)
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Prendergast (Ballygowan)
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Prendergast (Co Tipperary)
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Prendergast (Gort)
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Prendergast (Kiltormer)
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