Commercially available

• Crimson Perpetual
• Lee's Crimson Perpetual
• Lelieur (portland, Lelieur, pre 1820)
• Perpétuelle Lelieur
• Portlandica maxima
• Rose du Roi
• Rose Lelieur

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Average rating: EXCELLENT-.  

Medium red Portland.
Registration name: Comte Lelieur
Exhibition name: Rose du Roi (portland, Lelieur, 1812)

Bred by Ecoffey (France, 1812). Bred by Comte Jean-Baptiste Lelieur de Ville-sur-Arce (France, 1812).
Introduced in France by Calvert in 1819 as 'Lee's Crimson Perpetual'.
Introduced in Australia by F. C. Davis in 1862 as 'Lee's Crimson Perpetual'.

Damask Perpetual, Portland.  

Crimson, purple highlights.  Often 6 sepals.  Strong, damask fragrance.  Average diameter 2.75".  Medium to large, double (17-25 petals), borne mostly solitary, in small clusters bloom form.  Occasional repeat later in the season.  

Bristly , bushy, few or no prickles/thorns, upright.  Light green foliage.  5 to 7 leaflets.  

Height: 3' to 42" (90 to 105cm).  Width: 30" to 3' (75 to 90cm).

USDA zone 4b through 9b.  

Tetraploid

Parentage uncertain, please see References. The original 'Rose du Roi' often had six sepals.
The rose is generally attributed to Comte Lelieur, director of the gardens at Sèvres. However, some sources mention Souchet or Ecoffey as the gardeners who bred 'Rose du Roi'. Vibert in 1852 attributes the rose to Ecoffey.
Louis XVIII. reigned 1814-1824. If the rose was indeed named after him, then it cannot have been introduced before 1814.
See also the hybrid gallica 'Rose du Roi', bred in the 18th century.
Noisette states that the Bloom of 'Elise Voïart' resembles very much 'Rose du Roi'.