Courtenay of Tremere
Courtenay of Tremere was a Cornish cadet branch of the wider Courtenay family of Devon and Cornwall.
Last updated August 31, 2026
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Overview
Courtenay of Tremere refers to a historical family line rather than a modern commercial brand. The family was a cadet branch of the prominent Courtenay family associated with Powderham in Devon. That Devon line itself formed part of the broader Courtenay dynastic network descended from the medieval Courtenay earls of Devon, who had held important feudal lordships connected with Tiverton Castle, Plympton, and Okehampton. The Tremere branch was established in Cornwall and was associated with Tremere, also recorded as Tremeer and now identified with Tremore in the parish of Lanivet. Its recorded descent begins with Edmond Courtenay of Deviock, described as the fifth son of Sir Philip Courtenay of Powderham, who lived from 1404 to 1463. Through Sir Philip, the family belonged to the later Powderham line of the Courtenays. Sir Philip of Powderham was a younger son of Hugh de Courtenay, the second or tenth Earl of Devon, who died in 1377, and Margaret de Bohun, who died in 1391. Margaret was the eldest surviving daughter of Humphrey de Bohun, fourth Earl of Hereford, and Elizabeth, a daughter of King Edward I. Edmond Courtenay married Jane Deviock, a daughter and co-heiress of John Deviock of Deviock near St Germans in Cornwall. This marriage connected the Courtenay lineage with a Cornish landed family and helps explain the branch's territorial identity in Cornwall. The family is consequently best understood within the framework of medieval and early modern English landed genealogy, where a cadet branch was a junior line descended from a prominent family but established at a different estate or seat. The surviving historical account identifies Richard Courtenay of Lostwithiel as another notable member associated with Tremeer and names John Courtenay of Tremere as a Member of Parliament. The available reference material does not provide a complete chronology of the branch, a continuous list of its estates, or sufficient information to establish a modern corporate successor. It also does not describe manufactured products, commercial services, a contemporary owner, or an active business operation. Accordingly, Courtenay of Tremere should not be treated as a consumer brand in the ordinary commercial sense. Its significance lies in genealogy, landed family history, Cornish local history, and the political participation of members of the family.
History
The Courtenay family of Tremere was a junior Cornish branch of the Courtenays of Powderham in Devon. The Powderham family belonged to the wider Courtenay lineage associated with the medieval earls of Devon and with several important feudal lordships in Devon, including Tiverton, Plympton, and Okehampton. The branch's stated founder in the genealogical tradition is Edmond Courtenay of Deviock, identified as the fifth son of Sir Philip Courtenay of Powderham. Sir Philip lived from 1404 to 1463 and was descended from an earlier Sir Philip Courtenay of Powderham, who died in 1406. The earlier Sir Philip was a younger son of Hugh de Courtenay, the second or tenth Earl of Devon, and Margaret de Bohun. Margaret was a daughter of Humphrey de Bohun, fourth Earl of Hereford, and Elizabeth, a daughter of King Edward I. Edmond Courtenay's marriage to Jane Deviock, daughter and co-heiress of John Deviock of Deviock near St Germans, linked the branch to a Cornish inheritance. The family later became associated with Tremere, also rendered Tremeer and identified in modern geographic terms with Tremore in the parish of Lanivet. The place-name therefore became the distinguishing element for this branch of the Courtenay family. The historical record also associates Richard Courtenay of Lostwithiel with Tremeer and identifies John Courtenay of Tremere as a Member of Parliament. These references show that the family participated in the local landed and political life of Cornwall. The supplied sources do not establish a complete sequence of family heads, dates of residence, parliamentary constituencies, or later descendants. They likewise do not document a modern organization operating under the name Courtenay of Tremere. The family pedigree is discussed in John Lambrick Vivian's edition of The Visitations of Cornwall, which brought together heraldic visitations from 1530, 1573, and 1620 with later additions. Such visitation records are important sources for reconstructing the ancestry and status claims of Cornish families. Courtenay of Tremere is therefore principally an entry in British and Cornish genealogy rather than a conventional brand with products, marketing, executives, or financial performance.
Descent from the Powderham Courtenays
[1]The Tremere branch is traced to Edmond Courtenay of Deviock, described as the fifth son of Sir Philip Courtenay of Powderham.
Marriage into the Deviock family
[1]Edmond Courtenay married Jane Deviock, a daughter and co-heiress of John Deviock of Deviock near St Germans in Cornwall.
Association with Tremere in Cornwall
[1]The family became associated with Tremere, also recorded as Tremeer and identified with Tremore in the parish of Lanivet.
Parliamentary representation
[1]John Courtenay of Tremere is recorded as a Member of Parliament.
Products and positioning
A historical Cornish landed-family designation and genealogical subject, not a documented modern commercial brand.
Sources1 sources
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