唐代中葉,蘇密城為唐地方政權渤海(hai)國五(wu)京十(shi)五(wu)府之長嶺(ling)府治所、渤海(hai)通往中原王朝營(ying)州道上的重(zhong)鎮。
民(min)國二(er)十(shi)五(wu)年(1936年),日本人鳥山喜一、藤田亮策(ce)、巖間茂(mao)次郎等(deng)人對(dui)蘇(su)密(mi)城(cheng)進行了非法(fa)盜掘。
2013年(nian),吉林(lin)省文(wen)物考(kao)古研究所(suo)對蘇(su)密(mi)城進行了(le)主(zhu)動性考(kao)古發(fa)掘。
2014年6月-11月,吉林省文物考古研究(jiu)所對蘇密(mi)城再次進(jin)行了考古發掘。
蘇(su)密(mi)城(cheng)(cheng)(cheng)城(cheng)(cheng)(cheng)址(zhi)由蘇(su)密(mi)城(cheng)(cheng)(cheng)內外城(cheng)(cheng)(cheng)組(zu)成(cheng),內外兩城(cheng)(cheng)(cheng)重壕,城(cheng)(cheng)(cheng)址(zhi)四周依山(shan)傍水(shui),為輝發河沖擊盆(pen)地。
內城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng),坐落在外城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)中(zhong)央,成“回”字形,基本為正方形,四角高(gao)出城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)墻(qiang)(qiang),呈(cheng)四角樓遺跡(ji)(ji),東(dong)西兩(liang)門,位于東(dong)墻(qiang)(qiang)和西墻(qiang)(qiang)中(zhong)段內城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)四周,有較明顯的護城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)壕遺跡(ji)(ji),城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)墻(qiang)(qiang)為土筑夯實,夯層厚10-15厘米(mi),城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)墻(qiang)(qiang)高(gao)2.6米(mi),頂寬0.6米(mi),基寬7米(mi)左右,東(dong)城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)墻(qiang)(qiang)長337米(mi),南城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)墻(qiang)(qiang)長334米(mi),西城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)墻(qiang)(qiang)長369米(mi),北城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)墻(qiang)(qiang)長341米(mi),周長1381米(mi);
外(wai)(wai)城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng),大(da)致為(wei)長(chang)方形,東城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)墻(qiang)(qiang)(qiang)(qiang)長(chang)697米(mi)(mi)(mi)(mi)(mi),南(nan)(nan)城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)墻(qiang)(qiang)(qiang)(qiang)長(chang)535米(mi)(mi)(mi)(mi)(mi),西(xi)城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)墻(qiang)(qiang)(qiang)(qiang)長(chang)747米(mi)(mi)(mi)(mi)(mi),北城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)墻(qiang)(qiang)(qiang)(qiang)長(chang)611米(mi)(mi)(mi)(mi)(mi),周長(chang)2590米(mi)(mi)(mi)(mi)(mi)。城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)墻(qiang)(qiang)(qiang)(qiang)殘高3米(mi)(mi)(mi)(mi)(mi)-4米(mi)(mi)(mi)(mi)(mi),頂(ding)寬0.5米(mi)(mi)(mi)(mi)(mi)-1米(mi)(mi)(mi)(mi)(mi),底寬13米(mi)(mi)(mi)(mi)(mi)左(zuo)(zuo)右,四角(jiao)(jiao)有角(jiao)(jiao)樓,存(cun)東南(nan)(nan)和(he)(he)西(xi)南(nan)(nan)角(jiao)(jiao)樓遺跡,高出(chu)(chu)城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)墻(qiang)(qiang)(qiang)(qiang)約(yue)1米(mi)(mi)(mi)(mi)(mi),東南(nan)(nan)角(jiao)(jiao)樓向東突出(chu)(chu)1米(mi)(mi)(mi)(mi)(mi),東、西(xi)、南(nan)(nan)三面城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)墻(qiang)(qiang)(qiang)(qiang)保存(cun)較(jiao)好(hao),外(wai)(wai)城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)墻(qiang)(qiang)(qiang)(qiang)四門皆位于各墻(qiang)(qiang)(qiang)(qiang)中段,并筑有方形甕城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)。東甕城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)門和(he)(he)北甕城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)門已遭破壞(huai),西(xi)甕城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)和(he)(he)南(nan)(nan)甕城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)保存(cun)較(jiao)好(hao),突出(chu)(chu)城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)墻(qiang)(qiang)(qiang)(qiang)18米(mi)(mi)(mi)(mi)(mi)左(zuo)(zuo)右,開口向左(zuo)(zuo)。 內城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)西(xi)門南(nan)(nan)部城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)基可(ke)以看到河卵石(shi)(shi),可(ke)以看到一(yi)層(ceng)層(ceng)夯(hang)層(ceng)窩。城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)基是先敷(fu)石(shi)(shi)塊(kuai)和(he)(he)河卵石(shi)(shi),然后每隔10-20厘米(mi)(mi)(mi)(mi)(mi)為(wei)一(yi)個壘垛(duo)夯(hang)層(ceng)直至城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)頂(ding)。西(xi)面護(hu)城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)壕(hao)寬13米(mi)(mi)(mi)(mi)(mi),深2米(mi)(mi)(mi)(mi)(mi)左(zuo)(zuo)右。
2014年,吉林省文(wen)物(wu)考古研(yan)究所在蘇密城(cheng)外城(cheng)南部發掘25個灰坑遺跡(ji)和1處渤海國(guo)時期建筑,以(yi)黃(huang)黏土(tu)和黑黃(huang)花土(tu)夯(hang)(hang)筑,臺基(ji)(ji)南北約(yue)35米(mi),東(dong)西寬(kuan)約(yue)28米(mi),整個夯(hang)(hang)土(tu)臺基(ji)(ji)規(gui)模約(yue)為邊(bian)長(chang)35米(mi)的正方(fang)形,磉堆(dui)直徑(jing)1-1.5米(mi),同排磉堆(dui)中心間(jian)距約(yue)3.3米(mi),排間(jian)距近4.5米(mi),存磉堆(dui)8個,磉堆(dui)北側(ce)有長(chang)約(yue)6米(mi)夯(hang)(hang)土(tu)臺基(ji)(ji),臺基(ji)(ji)東(dong)側(ce)出土(tu)大量渤海國(guo)時期建筑灰陶(tao)瓦、瓦當(dang)、獸頭、鴟尾等建筑構件,10余塊礎石(shi),300余件陶(tao)塑佛像殘塊。
蘇(su)密(mi)城(cheng)不但是研(yan)究(jiu)渤(bo)(bo)海(hai)(hai)文明(ming)、渤(bo)(bo)海(hai)(hai)城(cheng)市(shi)發展軌跡(ji)的(de)(de)(de)重要(yao)線(xian)索和實(shi)證,同時也是渤(bo)(bo)海(hai)(hai)國(guo)與唐(tang)朝(chao)(chao)在政治、經(jing)濟、文化(hua)等諸方(fang)面相互交(jiao)流的(de)(de)(de)重要(yao)歷史見證。尤其對(dui)渤(bo)(bo)海(hai)(hai)國(guo)的(de)(de)(de)城(cheng)市(shi)發展史、建筑史等領域的(de)(de)(de)研(yan)究(jiu),具有特(te)殊的(de)(de)(de)學術研(yan)究(jiu)價值。蘇(su)密(mi)城(cheng)是渤(bo)(bo)海(hai)(hai)國(guo)與唐(tang)王(wang)朝(chao)(chao)之(zhi)間陸(lu)路(lu)交(jiao)通樞(shu)紐,被(bei)稱為渤(bo)(bo)海(hai)(hai)去唐(tang)、唐(tang)往(wang)渤(bo)(bo)海(hai)(hai)的(de)(de)(de)陸(lu)上東(dong)方(fang)絲(si)綢之(zhi)路(lu),具有很高的(de)(de)(de)歷史、文化(hua)、科學研(yan)究(jiu)價值。
1961年4月13日,蘇密城(cheng)被吉(ji)林(lin)省人民政府公布(bu)為省級重點文(wen)物保護(hu)單位。
2006年5月(yue)25日(ri),蘇密(mi)城被中華人民共和(he)國(guo)國(guo)務院公布為第(di)六批全國(guo)重點文物(wu)保護單位。
2007年6月,吉林省人民(min)政府設立保護(hu)范圍(wei):為蘇密城城址本體(ti)以外(wai)城墻基以外(wai)10米(mi);建(jian)設控制地帶(dai):為保護(hu)范圍(wei)以外(wai)100米(mi)。
唐玄宗開元元年(713年),粟末首(shou)級大(da)祚榮受唐冊(ce)封(feng)為(wei)左驍(xiao)衛大(da)將軍、忽汗州(zhou)(zhou)都督、渤(bo)海郡王,后人專(zhuan)稱其為(wei)渤(bo)海,“渤(bo)海國”名稱由此而來。其子(zi)孫因(yin)襲唐朝(chao)典制,傳至(zhi)十(shi)(shi)一(yi)世(shi)(shi)大(da)仁(ren)秀、十(shi)(shi)二(er)世(shi)(shi)大(da)彝尊(835年)在轄(xia)境(jing)內完成五京十(shi)(shi)五府(fu)六(liu)十(shi)(shi)二(er)州(zhou)(zhou)一(yi)百余縣的(de)(de)(de)建置,成為(wei)遼(liao)東盛國。輝發河故道(dao)南(nan)岸的(de)(de)(de)蘇密甸(dian)子(zi)(粟末的(de)(de)(de)音轉)系沖(chong)積(ji)盆地,平坦開闊,近山傍水,“為(wei)水陸(lu)之要沖(chong)”,境(jing)東有綿(mian)亙四十(shi)(shi)余里的(de)(de)(de)張廣才嶺為(wei)屏障,渤(bo)海國在此設長(chang)嶺府(fu)治,領瑕、河二(er)州(zhou)(zhou),建有具備(bei)府(fu)治規模的(de)(de)(de)蘇密城(即(ji)(ji)那丹佛(fo)勒城),是當時營州(zhou)(zhou)道(dao)上的(de)(de)(de)重鎮。樺甸(dian)即(ji)(ji)渤(bo)海王朝(chao)長(chang)嶺府(fu)屬地。