Upon becoming bishop, Lamberton found himself in control of the diocese's vast funds; he used them to fund the war against England. He would also act as an important
diplomat and
envoy for Scotland. Lamberton remained a supporter of Scotland's independence and was even excommunicated for his role.
Diplomacy When being consecrated as bishop, Lamberton went to France to build support for Scotland in the French Court and
Papal Curia. As early as June 1298 Lamberton had won victories for the Scottish cause; his activities led both the King of France
Philip IV and
Pope Boniface VIII to pressure
Edward I to halt his attacks on Scotland. It led to Scotland's deposed king
John Balliol being handed over into papal custody in 1299. In a letter to Scottish leaders dated 6 April 1299 Philip IV commended Lamberton's efforts and declared he would assist Scotland. Despite the Bishop's pleas, he did not send a military force to Scotland. Lamberton returned to France in 1301, and then in 1302, to keep pressing for France's support in the war. Lamberton clearly formed a bond with Philip - the French king intervened several times for Scotland. Bishop Lamberton's diplomatic abilities were later recognised by the Scottish Magnates when he was chosen as a third Guardian, alongside Robert Bruce and
John Comyn in 1299. Lamberton was later charged with treason against Edward. After Edward I's death on 7 July 1307, Lamberton swore fealty to his son
Edward II. The bishop was released in August 1308 on onerous terms and was not free to return to Scotland. He promised to pursue the English King's enemies, pay a ransom of £6000 in installments and remain within the boundaries of the See of
Durham. Lamberton saw his oath to Edward II as a necessity and extorted from him under duress, and therefore it was invalid. During his time in England, Lamberton remained near the Tweed so that he could maintain connections with the parts of his diocese under English rule. Lamberton also wrote a letter to Philip of France asking for the King to help him gain freedom from England. Lamberton attended negotiations in 1309 as an "English" envoy, and his skill as a diplomat helped him to keep on good terms with both Edward and Robert. Lamberton would never again collaborate with the English and Edward even attempted to have him ousted from the See of St Andrews in 1318 by writing letters to the Pope charging Lamberton with treason. However, Edward's efforts failed. Lamberton along with
Thomas Randolph, 1st Earl of Moray served as the Scottish negotiators in 1323 when a thirteen-year truce was agreed to between Scotland and England.
Excommunication and Reconciliation Lamberton and three other bishops were summoned to Avignon to explain their actions but chose to defy the summonses. Lamberton was excommunicated on 16 June 1320. King Robert and the Community of the Realm sent three separate replies to
Pope John XXII; the last group's letter, now known as the
Declaration of Arbroath, is the most famous. However, although the Declaration of Arbroath received some positive response, because of English pressure, the pope continued the excommunications and interdict although thanks to a personal plea at Avignon by
Thomas Randolph, 1st Earl of Moray in 1325, the pope did at least acknowledge Robert the Bruce as King of Scots. == Death ==